It seems to me the intrusiveness of age verification will continue to grow.

They want the OS to report the user's age. People will use this to claim whatever age they want. For instance, if companies cannot advertise to children, they might find that almost every computer is reporting that the user is a child--turns out adults want the protections kids receive as well--sometimes.

Eventually they will have to enforce a system intrusive enough that no lying or abuse of the system is possible. We might even approach "Verification Can" levels of verification.