User blog comment:MisterWoodhouse/Announcing an Ask Me Anything with Fandom's CEO/@comment-38112203-20200224173553/@comment-1807002-20200224233859

I don't think wikia/fandom allows underage accounts either. Not that kids don't create accounts anyways.

I believe it requires a phone number to set up an account- if this user does not have a phone or it is a phone paid for by parents- who are in full right to set those limitations since they most likely are paying for the phone.