Wear ear protection at concerts, dammit!

Garytown , Kristina D.C. Hoeppner / flickr Report

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Diet, posture, physical activity. All of those are much easier to correct in your 20s than your 40s.

Creative_Pollution84 , freepik Report

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Wear some freaking sunscreen. Skin cancer sucks!

Dock_Rocker , freepic.diller / freepik Report

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Their teeth. You get only two sets of teeth and the first is lost at a very early age.

Invest in an electric toothbrush and use it liberally.

crazycatlady331 , Ave Calvar / unsplash Report

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Time with the family & your elders. You miss miss them when they're either passed (parents, grandparents) or all grown up (sweet children, nieces & nephews).  Even time with elder mentors, such as teachers.


Enjoy everyone while you have them and while they have you! 

Delsym_Wiggins , Getty Images / unsplash Report

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Sleep, FOR THE LOVE OF GOD SLEEP, nothing will f**k you up long term than thinking going without sleep isn't going to hurt you.

ioshta , Daniel Martinez / unsplash Report

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Everyone saying their health, which isn't wrong.

What's really going to affect you is your parents' health, presuming they're still alive and you have a good relationship with them. If your parents live into old age, they will need more and more help. They won't understand how things work. They'll be more susceptible to scams. If they're like mine, they'll be stubborn and won't acknowledge their weakening faculties. Try getting someone who's driven for 60 years to surrender their license because their eyes aren't so good.

And when one dies, the other will likely have fallen into a very co-dependent lifestyle, and the structure is completely destroyed.

You know it's going to happen, but you don't realize how it'll manifest itself until it plays out.


Edit: well, this took off. Glad to hear this actually helped some people. But yeah, it sucks.

AmigoDelDiabla , katemangostar / freepik Report

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The power of compounding interest. For the love of god, start socking some money into your retirement as early as possible. Look at the charts online of the difference between starting to save a little when you’re younger versus how much you have to put away when you’re older to actually retire one day.

zenpoohbear , wirestock / freepik Report

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Lack of stretching. Stretch younglings, stretch.

Small-Explorer7025 , Wesley Tingey / unsplash Report

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Travel internationally in your 20s when you’re single, with friends, stay in hostels if you have to

omniron , marymarkevich / freepik Report

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Cut back on the carbs and sugar now. Also, keep exercising. Don’t take a break in your 30’s because the kids are keeping you too busy. Trying to lose weight in your 40’s is torture. I’ve been hungry for 3 years.

-Words-Words-Words- , Davey Gravy / unsplash Report

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I would reverse the question. Most 20 somethings think soooo many things are the end all.

Basically, none of it matters. Keep working on being the best person you can be.

Fantastic-Spend4859 , Getty Images / unsplash Report

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People in their 20s don’t realize that every year they live isn’t just another trip around the sun; it’s another brick added to the backpack you’re carrying through life. When you’re young, that bag’s practically empty—light as hell. You’ve got a few memories, a couple of heartbreaks, maybe a regret or two, but nothing that really weighs you down. You’re sprinting through life thinking it’ll always feel this fresh and easy.

But by the time you hit your 40s, that backpack’s packed to the brim. Every relationship you’ve had, every choice you made—or didn’t make—starts to add up. It’s not just the passage of time; it’s the *weight* of that time. You’ve got the good stuff—family, love, achievements—but you’ve also got the “what-ifs,” the missed opportunities, and the regrets. Those regrets? Man, they’re like invisible bricks—things you didn’t even know would haunt you later. Not calling someone when you should’ve, passing on that one big risk, staying in a bad situation too long... all that stacks up.

And memories? Oh, those hit different too. They start to stick to you like wet cement—some beautiful, some bittersweet, some straight-up painful. You don’t realize in your 20s that every phase of your life leaves a mark. It’s not just time flying by; it’s life building up behind you. By 40, you’re dragging around this whole-a*s timeline of experiences, relationships, and regrets. The weight of all that can be inspiring or crushing, depending on how you dealt with it.

In your 20s, you’re running free with a clean slate, but every year that slate gets messier. And one day, you wake up and realize you’re not just living for the moment anymore—you’re carrying the weight of every moment you’ve ever lived. That’s the s**t nobody warns you about.

Lawncareguy85 , Nina Zeynep Güler / unsplash Report

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Their online behavior.

You can see it on reddit every day. Grown ups in their twenties don't know the very basics of human interaction. Get off of tictoc, insta and reddit. That's not the real world. In fact it is as far from the real world as it could be.

Get out, touch gras. I can't believe I'm writing this.

Fitz911 Report

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Some tips:
Waer earplugs anywhere loud because tinnitus is a f*****g curse. You can still enjoy stuff with them in.
Sunblock EVERY TIME YOU'RE OUTSIDE because the sun eats the youth from your face. And can also give you cancer. Wear sunglasses too.
Moisturise with simple cream like cocoa butter. Every time you bathe or shower All over.
Eat well. Lots of fibre. Drink water.
Look at your poop and be aware of what's normal and what could possibly be warning signs of serious illness (dark blood, black poop etc.) Bright red blood usually means hemorrhoids.
Check your boobs or balls regularly for lumps. If you find one go to the bloody doctor.
Brush your damn teeth with fluoride toothpaste before you go to bed. Circular motions. Don't scrub them like a dirty saucepan. Don't brush immediately after eating or drinking. Don't rinse your mouth afterwards. Don't use alcohol mouthwash. Any pain at all go to the dentist. Infections can kill you.
Don't ignore chronic symptoms like a cough or stomach pain or chest pain.
EXERCISE aerobic and weight bearing. Dancing around your living room is good.
Don't eat or drink anything with artificial sweeteners if possible as they're evil.
Don't drink sugary drinks. A lot of weight gain can be caused by drinking excessive calories. It's not just food that makes you fat.
Vitamin D supplements.
Read. Books, articles, creepy pastas, anything.
If you have the opportunity to do something that'll make you happy that won't hurt anyone then just bloody do it. Don't stand in your own way. Regret is a curse.
I love you. You're awesome. Be the best you that you can be.

QueenEris , Andrej Lišakov / unsplash Report

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Like everyone else said - Your health goes downhill after 40. Get active. Enjoy it. Love it.

Find out your family’s medical history. In some cases, doesn’t matter what you eat or drink, you’re gonna get nailed with diabetes or heart disease or cancer. Find out if it runs in your family history and prepare/plan for it.

Save your money. And if you already are, save even more. Inflation / Cost of living has shown us that a million dollars doesn’t even buy a home here. Doesn’t keep you comfortable for retirement. Save, invest, become financially literate.

People will come and go. Don’t get attached or take it personally. We are all on our own journey. Enjoy them when they are with you and be happy for them from afar when they drift away.

mr-blister-fister , Joseph Corl / unsplash Report

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I've seen way too many people who spent their 20s and 30s grinding. They end up with full bank accounts, but no real friends, community or life experiences. Those are the people who end up with epic mid life crises.

Money comes and goes, but genuine friends and experiences can't be bought.

Jorge-O-Malley , freepik Report

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Real talk here, and this is not something I am seeing elsewhere in this thread.

Learn that it CAN be you. You are NOT immune and you will, in some way and at something, become a statistic.

Everyone thinks it won't be them:

You won't get in a car accident, you're a safe driver.
You won't get diabetes, you've always been good about sweets.
You'd never fall for propaganda, you're too smart for that.
You'd never end up in a cult, only gullible people believe in stuff like that.
You'll never end up on the streets or in prison, you would never commit a crime.
You'll never get cancer, that's something that happens to old people, or smokers, or people exposed to radiation.
You'd never fall for obvious advertising, you're too smart to be caught by tricks like word choice or urgency or edited photos.
You'll never fall for a scammer, you know better than that.

Become comfortable with the fact that things WILL happen to you. That you'll get sick or injured or develop a chronic illness. That you'll get taken in by what in hindsight will be an obvious scam. That you'll believe someone's lies, or end up impoverished or desperate, or if YOU were in such-and-such situations you very probably would make the same mistakes that anyone in that situation would.

Being aware that you aren't likely to be the exception to the rule is a kindness to yourself and others.

Example: People don't fall for elder abuse scams because they're *stupid.* Elders fall to these scams because when cognition begins to decline, medically speaking, one of the first things to go is our suspension of disbelief. It's a normal and expected part of aging, and while it might NOT happen to you, remembering that it could will help you be more compassionate to others victimized in this way. It will also allow you to develop habits that will prevent you (or elders you love) from being taken advantage of in this way before it happens.

The same applies to everything else — reminding yourself that you aren't some elite being who avoids all trauma because you're smarter/faster/stronger/better makes you kinder and allows you to prepare in the event that something bad DOES happen to you.

And oh, my friend, something will happen to you, sooner or later. You will be a statistic in one way or another before (or after) you die.

lovebyletters , Andrej Lišakov / unsplash Report

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Ladies and gentlemen of the class of ‘99
Wear sunscreen

If I could offer you only one tip for the future, sunscreen would be it
A long-term benefits of sunscreen have been proved by scientists
Whereas the rest of my advice has no basis more reliable
Than my own meandering experience, I will dispense this advice now

Enjoy the power and beauty of your youth, oh, never mind
You will not understand the power and beauty of your youth
Until they’ve faded, but trust me, in 20 years, you’ll look back
At photos of yourself and recall in a way you can’t grasp now
How much possibility lay before you and how fabulous you really looked
You are not as fat as you imagine

Don’t worry about the future
Or worry, but know that worrying
Is as effective as trying to solve an algebra equation by chewing Bubble gum
The real troubles in your life
Are apt to be things that never crossed your worried mind
The kind that blindsides you at 4 p.m. on some idle Tuesday
Do one thing every day that scares you

Saying, don’t be reckless with other people’s hearts
Don’t put up with people who are reckless with yours

Floss

Don’t waste your time on jealousy
Sometimes you’re ahead, sometimes you’re behind
The race is long and in the end, it’s only with yourself
Remember compliments you receive, forget the insults
If you succeed in doing this, tell me how
Keep your old love letters, throw away your old bank statements

Stretch

Don’t feel guilty if you don’t know what you want to do with your life
The most interesting people I know
Didn’t know at 22 what they wanted to do with their lives
Some of the most interesting 40-year-olds I know still don’t
Get plenty of calcium
Be kind to your knees
You’ll miss them when they’re gone

Maybe you’ll marry, maybe you won’t
Maybe you’ll have children, maybe you won’t
Maybe you’ll divorce at 40, maybe you’ll dance the ‘Funky Chicken’
On your 75th wedding anniversary
Whatever you do, don’t congratulate yourself too much
Or berate yourself either
Your choices are half chance, so are everybody else’s

Enjoy your body, use it every way you can
Don’t be afraid of it or what other people think of it
It’s the greatest instrument you’ll ever own
Dance, even if you have nowhere to do it but your own living room
Read the directions even if you don’t follow them
Do not read beauty magazines, they will only make you feel ugly

Get to know your parents, you never know when they’ll be gone for good
Be nice to your siblings, they’re your best link to your past
And the people most likely to stick with you in the future

Understand that friends come and go
But a precious few, who should hold on

Work hard to bridge the gaps in geography and lifestyle
For as the older you get
The more you need the people you knew when you were young
Live in New York City once but leave before it makes you hard
Live in northern California once but leave before it makes you soft

Travel

Accept certain inalienable truths
Prices will rise, politicians will philander, you too, will get old
And when you do, you’ll fantasize that when you were young
Prices were reasonable, politicians were noble
And children respected their elders

Respect your elders

Don’t expect anyone else to support you
Maybe you have a trust fund, maybe you’ll have a wealthy spouse
But you never know when either one might run out

Don’t mess too much with your hair
Or by the time you’re 40 it will look 85

Be careful whose advice you buy but be patient with those who supply it
Advice is a form of nostalgia, dispensing it is a way of fishing the past
From the disposal, wiping it off, painting over the ugly parts
And recycling it for more than it’s worth

But trust me on the sunscreen

catshealmysoul , Leandro Crespi / unsplash Report

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Cynicism. You'll disguise it as "realism." But you gotta get past that s**t to wisdom. And even then, you get maybe a tiny kernel of wisdom, if you're lucky. But it's better than sauntering through life feeling hard done by. I've moved on from friends who thought this way, people who don't lift you up and are only too happy to help you down.

A_Refill_of_Mr_Pibb , freepik Report

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I'm 39, stay fit, stop drinking all the time, and save my money and invest 

anon , Getty Images / unsplash Report

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Sticking with a person you are never going to change. Worst mistake ever.

mom2point0 , freepik / freepik Report

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Never expect too much from ppl.. Some ppl enters your life to stay , some are like travelers will pass you by, some are there to give you a lesson then walk away.. So keep your distance from others and protect your boundaries so you won't get disappointed . .. Always tell yourself " THIS TOO SHALL PASS "

proudintrovert82 , freepik Report

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Save money. When I was 20 I used to say, I’ll start saving when I get a good job. Well, my dream job came at my 40 and I spend 20 years just spending money and not saving. When i say save money I mean save and invest

elctronyc Report

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Eating too much fast food, junk food, and alcohol. Get out of those bad habits now!

DifficultyCharming78 , Oleg Ivanov / unsplash Report

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That physical job is not paying you for the damage it does to your body. I did flooring for 18 years before I got out of it. I was a sub contractor and made great money. Until I realized that it wasn't enough to fix my joints. I have shoulder problems from carrying rolls of carpet and pad up endless flights of stairs. I was lucky and somehow my knees are ok.

mtabacco31 , Bermix Studio / unsplash Report

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Take care of your mental health. Cut down toxic relationships. You are worth it! ❤️

Kaizen321 , freepik Report

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Stop running from your issues and address them.

You want to know what unchecked ADHD is *really* like? Imagine waking up one morning and 19 years have gone by. You haven’t worked on yourself, your goals, or your financial health, and you can’t remember the last time you actually did something to improve yourself.

I lived that journey for you. It sucks. It really sucks.

Mikknoodle , freepik Report

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I never really thought about it until now but in my teens and 20s I was always into rough sports, Rugby, Skateboarding, Dirt Biking etc and I always pushed it too far and would get hurt. Older folks would say “you are going to feel it when you are older. I’m 40 now and feel great. I have friends that didn’t do much physical their whole life and they have back and knee issues and stuff. I continue to stay active, I shoe horses for a living, still dirtbike, ride horses and snowmobile. I feel great.
So my advice is stay active, even if it’s risky.
EDIT: Also take your mental health seriously and get help soon even if you are just slightly depressed or anxious. Putting it off for years can have devastating lasting effects.

Kgwalter Report

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That 'sleep is for the weak' mindset. Your back and knees will file a formal complaint.

AuroraAdept8 Report

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High impact sports: I know a lot of guys who busted their knees either from going hard skating during hockey or basketball.
Listening to loud music with headphones: A lot of friends who are hard of hearing.
Smoking weed: Again a lot of friends turned inward because they can't handle the anxieties of normal everyday life anymore and now they're isolated and slowly going paranoid skitzo with intrusive thoughts.

tiredofthebites Report

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Take care of your joints.

For f**k sakes! Sleep!

Employers don't actually give a f**k about you. Family is more important than career.

You never really leave high school.

Not knowing how to cook.

FromundaCheeseLigma Report

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Being mean to their knees. Take care of them. You only get one set.

AwwAnl-4355 Report

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Friends don't last. I remember my best friend's mother saying that and it is a very important thing to know in your 20's when a social life is easy and natural.

Keeping strong connections with people who matter in our life is really important.

Divorce, lost a job, bankruptcy and illness - one or another - are very usual at 40's and it could, suddenly, show how alone someone really is and hit hard.

One is the most dangerous number.

Exiledbrazillian Report

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Loving someone does not mean they are a good life partner. If you choose to get married or common law relationship, be realistic about your partner's finances because they are about to become your own. I'm not saying choose a partner based on their income, but rather choose a partner based on their sense of responsibility and the lifestyle they want. When I got married I got caught in the "it's ok, we love each other so we'll be all right" mentality and ignored red flags -- inability to hold down a job, not prioritizing what we needed over what he wanted, and a general sense of expecting to be taken care of rather than contributing. In the divorce I very nearly lost the house I bought entirely on my own and lost a good portion of my retirement due to his debt. And I got lucky, the judge ruled I was not responsible for his student loan debt, otherwise I don't know how I'd be getting by.

treecatks Report

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Not rehabilitating physical injuries

salty_strayan Report

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If you don’t have fun in your 20s, you might also be sad in your 40s! Say yes to life. Go out with a friend. Climb a mountain. Go on a trip. Try that new restaurant. Start having fun and learning to enjoy life so when you are 40 you can look back with happiness and no regrets.

bernea Report

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If you have a job in your twenties where you keep hurting your back, get the f**k as far away from that job as possible. It's going to be hell in your 40s if you don't smarten up now.

MikoSkyns Report

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This one is especially for the women: when you apply serums and moisturizers to your face, do your neck also! Treat the skin on your neck as part of your face now, and you won’t have the dreaded crepey neck quite as bad when you’re older. (I’m in my 50s now, but it’s still good advice).

Also - others have noted this already, but start saving or contributing to a 401k or IRA as soon as possible. Even a little bit of money saved from each paycheck will really add up over time, and if you start now, you’ll never really miss the small percentage that you contribute each month.

Direct_Access_9726 Report

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Being abused by anyone can give you PTSD. I had no idea, because I thought it was something you get if you go to war, watch someone die, things like that. If I'd known, I would have done more to leave certain situations sooner. You just think everything will be okay once you can get away and put it off because it's scary to stand up and say "no more". But it has a tangible effect on your brain and cognition. I wish I'd known.

Pour_Me_Another_ Report

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The most important and impactful decision you will make is the partner you choose

Shoddy_Cold_2807 , Natalia Blauth / unsplash Report

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Skincare. Your body’s health. Exercise. Eating right.

WanderingSoul-7632 , Leandro Crespi / unsplash Report

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All the little injuries add up. Getting out of bed in the morning is an adventure.

Fraudulent_Beefcake , Lifestylememory / freepik Report

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Not saving enough of their income for retirement

Defiant_West6287 Report

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*everything.*

Take care of your body. Eat well. Exercise regularly. Avoid intoxicants. Don't push yourself too hard. Get good sleep. Don't stress when stress can be avoided. Use sunscreen.

Do everything people nag you to do or you'll start falling apart by the time you're 30.

Also, there is no such thing as disposable income.

kleggich , teksomolika / freepik Report

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Maintain your dental health.

LexiClassy Report

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If you worship the sun ☀️ without protection from the sun, say hello to wrinkles early on. Even in your early 30s. Take care of your skin!!

ahlaj77 Report

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You need to start saving and investing now.

You need to start eating right and taking care of your health now.

Any upkeep and maintenance deferred is going to accrue interest.

Do little and often, now—or be prepared to pay up big time down the road.

Treat all this stuff like brushing your teeth and flossing (yes, you need to do that too).

One-Calligrapher757 Report

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Your parents not properly planning their end of life care.

TheSlurryBaron Report

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Lots of great responses in here mainly related to health and lifestyle choices... but let's not forget one of the most important ones:

GET RID OF THE NEGATIVE ENERGY IN YOUR LIFE. that includes bad habits and bad people... even if they're family. i've seen some people keep losers (male & female) around for far too long, and they got bogged down with their problems. then, when they needed help, the losers pulled them down even more.

the people you choose to have in your life can greatly affect the course of your life... make sure they're adding and not subtracting.

untied_dawg Report

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Floss, eat less processed sugar and brush your teeth…

Ok_Scratch_9736 Report

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Don’t grind too hard, all my friends who grinded in their 20s now are 45 hanging out at the club as they missed their moments.

Enjoy your young time, get a degree or trade in something, and don’t stress. You just need enough money to make memories

Correct_Training1694 Report

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Thinking like you're 20 when you're 40 mentality. We can all scream to the top of our lungs about dieting and exercising and all that but at the end of the day there's many of us still stuffing our faces with McDonald's and sleeping in because we're exhausted from work.

battleshipclamato Report

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Try to max out your 401k/IRA contributions.

ADtalra Report

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Not saving money. The 20’s are the very most important time to save all you can. If you do, you will retire rich. If you don’t, you will be living paycheck to paycheck as retirement approaches.

doeldougie Report

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That time when you were 23 and you crashed mountain biking, landed on your head and got up and started riding again? That could be a cervical fusion to relieve crushed discs pain when you’re 43.

Thayes1413 Report

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Wasting all your time trying to get high.

Nutsack_Sledgehammer Report

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Hearing, I’m 51 and can’t stand the tinnitus I experience constantly. Spent way too many nights at Crobar in Chicago during my 20’s. If you go to clubs or concerts, wear ear plugs

romapho Report

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I would have to say keeping up with your 401K’s. I’ve been working since 16 and since then have always paid into a 401K if given the option. The sad part is no one, including myself, bothered to explain them. It was something I always just paid into because I thought it was the responsible thing to do.

Throughout my work history I have accumulated over 8 401K’s from different jobs that were simply left behind when leaving the jobs. It was not until my early to mid 30’s I began to understand more about them, and to be fair still a little foggy on, then had to do the footwork to track down and consolidate them all. I wish that was one thing that could’ve been taught to me at a much younger age.

r0r0157 Report

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Drink more water

Civil_Advisor_4096 Report

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