Just curious how is it even possible to gamble at the age of 5? 
Unless, it is not the kid that is gambling but someone at a right age that doesn't wanna get tracked down right? Well, the point is, the age restriction system will not really work here unless they implement KYC system with real time verification. Because merely, an ID's could still be used to steal identity to a person if they really want to gamble with a restricted age.
I actually didn't think about it before. Thanks for sharing a different point of view. Also, agreed that KYC implementation make users more 'vulnerable' to data leaks but in general KYC is needed for projects that aim to be legal and fair.