I'm all for helping parents to do this. Any site requiring age verification should indicate this as a http header or whatever, and the browser I allow my child to use should respect that and the parental controls should be easy for me to engage with

Many parental controls are massive pains to get working. Apple does fairly well (although I don't get a parental pin number to unlock the phone, which is normally fine as my child will tell me, but in some circumstances it wouldn't be), but does require the parent to be on the apple ecosystem too.

EA and Microsoft however are terrible, especially as it's likely the child will be playing fortnite/minecraft and the parent won't have ever touched it. I think with minecraft we had to make something like 5 or 6 accounts across three different sites to allow online minecraft play from a nintendo switch.