I think it's that one person is lazy and lies (Jan 1, 1900), and the other enters their real birthday.

Because no one alive today was really born in 1900 :) lol. Plus peeps that do this don't want their real b-day on that site

I just freaking realized how many of replies this comment got i just freaking shat brix i know that makes no sense but what do u expect from the mentally insane llama

One don't care (1900...) and one is serious about it.

Usually is age verification to enter a site. There's people who put their exact birthdate and others (like me) who chose an arbitrary year above the age verification date.

Some people actually type their date of birth, while others (me) just change the year column to a random year older than the required age.

One doesn't bother and uses the default provided; the other specifies it exactly.

I think it is whether you enter your true birthday when requested, or a bogus one.

Some people put their actual birthdays. Others couldn't be bothered and just change the year to something random... Hence the bday of January 1st 1900

The one the left didn't fill in their real birth date just an easy to remember date. The one on the right did.

The one on the right bothers to input the correct date. The one on the right would just press continue

One enters a fake birth date, the other is truthful.

one is open about it and the other doesn't want to give the information

the one on the left is more American (mo, day, year), whereas the one on the right is the way the rest of the world tends to write it (day, mo., year)

Thats because you are a man, and intelligent.

Missing the point entirely. There are TWO types of people. ONE chooses one thing predominantly and the other type chooses the other. There is no THIRD in these examples. Just two. But for argument's sake, you could be driving a tank, an aeroplane...

DUH!! read the description!