alt Hacker NewsI want to agree with you, but if it's my system and my browser reporting my bracket, wouldn't it be trivially easy to inject an http-header with the age I want to report?
And by "trivially easy" I mean "somebody already posted how-to for windows to stackoverflow"
The problem is not that it's hard to cheat (it's easy), the problem is it makes you officially a liar and liable for "illegal app use".
It might not be a problem for you, but some underage kid, who lied about their age, gets addicted to a game with in-game purchases and gets into financial trouble now has no recourse against the company who made the addicting game.