As for enforcing the laws I don't think it would be that difficult, I think they could create a simple means of verifying age that doesn't compromise the rest of your identity.

Begs the question how. I don't think it's that simple. Sure you could do something ineffectual but it's kind of like the "simple solution to gun violence is banning guns" the guys that follow the law will turn theirs in, but they aren't the ones doing the gun crime.