Thread:Applemasterexpert-fduser/@comment-32429852-20191119192620/@comment-34888194-20191119204827

is the age of a user's account, not the age of the user "human being". Also, Fandom would have prevent users registering in to Fandom if they are underage.

Are you trying to filter bad usernames? Keep in mind that some profanities are being blocked by the global spam filter, so there's really no need to add filters to block them. Plus bad usernames would need to be reported to Fandom since it's a violation of ToU.