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I am working on an app which asks for date of birth of users during signup process. The app can be used by users of all ages. Having said that, I think there must be some validation in place. In my opinion kids should be at least 13+ (which also clears FTC guidelines) to understand and use the app. But what should be the max age limit?

Here are some findings from the web (Format = Brand name | Min year | Max year):

  1. Google | 2015 | 1866
  2. Yahoo | 2015 | 1885
  3. Facebook | 2015 | 1905
  4. Apple | 2015 | 1865

(All provided a dropdown menu and in all above cases, I couldn't create an account with year of birth as 2015 due to validations/legal constraints. Wondering why provide 2015 as a menu item in the first place?)

  • If Wikipedia is correct, there are two people left who are known to have been born in the 19th century. – Crissov Nov 23 '15 at 9:09
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While I don't think there a definitive correct answer, I'd think you're pretty safe by allowing a 100 year differential. The time you've spent posing this question will probably have cost more than any lack of revenu by a disgruntled 110y old user that feels he/she can't properly register in your app.

  • I was also referring to confusing validation rules of some of the most widely used brands. I hope you must have noticed that as well. It's more of an observation rather than an hypothesis. Ty. – Ramnath Mar 22 '16 at 14:26
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Giving a 100 year (since most people wont live above a 100) till the dob of your 13 year olds would make sense. then would be 1902-2002

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If you're putting an upper age limit on the sign up process, why not use the world's oldest person as a reference?

According to Wikipedia's list of oldest people - which we all know the one and only version of the truth - the longest living person alive is 116 years old.

If you use the their year of birth then you're catered for all eventualities in the future (unless a 170 year old is suddenly discovered!).

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