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When I started data mining the StackOverflow database, I found a surprising number of users had set their birthday in a way that made them 89 years old.

I blogged about it and gave a full list of the 89-year-old users, and here's a few:

And it's not like it was an even distribution - there were much less 80-87 year old users, and no 90 year old users. I'm guessing these users picked a date 89 years ago (so, somewhere about 1920) that has some special significance, but I can't figure out what it might be.

What's so special about year 1920?

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Looks like a totally valid question, voting to reopen. – Shadow Wizard Jan 18 '14 at 21:05
Just to deal with 'too localized' argument: those users are probably 'older' now, and they've all, for some reason, chosen the fake birth date '1920'. This question could be forked to ask about the etiquette of giving fake dates in their profiles. – Danubian Sailor Jan 19 '14 at 13:57
@ŁukaszL. indeed, they are four years older. As explained in the answers, they didn't choose random date but the minimum possible date. – Shadow Wizard Jan 19 '14 at 14:00
up vote 39 down vote accepted

Actually, I suspect that the "89 year old" users are simply using the oldest date they're allowed to by the system. If you try to set your birth year before 1920, the system will return an error:

Oops! There was a problem updating your profile:

Birthday - must be after 1920/01/01

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Interesting - wonder why some users are older then, like and ... – Brent Ozar Jul 4 '09 at 0:47
That is a good question. Those user IDs are fairly low, so perhaps they signed up and provided their (obviously fake) DOB before the check was in place? – Kyle Cronin Jul 4 '09 at 0:48
i guess this means my grandfather couldn't participate in stack overflow. this is ageism. i'm gonna get grandpa to file suit. – Kip Jul 4 '09 at 1:01
i should've made that an answer instead of a comment... i couldn't gotten some rep out of it! ;) – Kip Jul 5 '09 at 20:34
Yeah ... its time we get rep for votes on comments ;) – Rashmi Pandit Jul 7 '09 at 6:08
Why use 1920 as the check? If people are going to add a fake date of birth then this clearly doesn't stop them and it is not impossible that it might be someone's genuine date of birth. Shouldn't the earliest date be something biologically unprecedented? – Martin Smith Jan 19 '14 at 14:11

This sounds like blatant ageism. How do you know a 90 year old man wouldn't be a useful member of the website!?

share|improve this answer
That's sexism. What about a 90 year old woman? – Dennis Williamson Jul 5 '09 at 3:12
That's speciesism. What about sentient dogs, cats, and hemaphroditic extra-planetary aliens? – Michael Meadows Jul 9 '09 at 14:30
That's living-creaturism. What about rocks? – çağdaş Jul 20 '09 at 17:02
That's matter-ism. What about clouds of energy? – Kevin Panko Dec 9 '09 at 18:45
That's realism. What about invisible unicorns? – Otto Allmendinger Feb 25 '10 at 18:41
That's conceptualism. What about? – balpha May 30 '10 at 18:36
24th prime number? that's so beautiful :') – scienceHasFailedOurWorld May 17 '13 at 16:13
The jokes are cute, but it's a serious point. – Keith Thompson May 28 '13 at 21:08
That's... what. – NReilingh Jun 9 '13 at 23:38

Even more aggravating is the fact that we do not allow young users on this site.

Birthday must be before 2002/05/30

I was going to sign my 5 year old up for the site cause he was having some programming problems. I had to tell him to lie about his age. He was not too happy.

share|improve this answer
There are plenty of his peers posting on meta. – Rosinante May 30 '10 at 22:17
+1 for teaching your child to lie :) – JYelton Feb 15 '11 at 18:56
@JYelton LOL! Ahahahaha! +1 to you, but not to @Earlz. – Dr Beco Apr 1 '11 at 3:12
5 year old????? – MCKapur May 19 '12 at 2:39
Actually, it should be 5 year young. – Danubian Sailor May 28 '13 at 19:42
Exactly. I am actually currently 10, but I signed myself up as 13. Come on, can't the younger generation have something to say? – user265551 Jul 10 '14 at 13:04
@SmallDeveloper, it could be caused by the Children's Online Privacy Protection Rule: "COPPA imposes certain requirements on operators of websites or online services directed to children under 13 years of age, and on operators of other websites or online services that have actual knowledge that they are collecting personal information online from a child under 13 years of age". – Cristian Ciupitu Jul 13 '14 at 0:43
Yeah, OK, blah, blah, rules, rules, rules – user265551 Aug 17 '14 at 9:54
@Earlz, Instead of a plain "NO", there should be a link to a page describing what must be done for the poor child below 13 to sign up without lying about his age. – Pacerier Apr 26 '15 at 13:49

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