Sir Arthur V Quackington

“If”

They will. Once the age check at an OS level is implemented, the next level is to enforce that this check then use a verification service. And then to make this information available to sites upon access.

That is probably a slam dunk (minor) discrimination lawsuit. Your circumstances of birth, including the date, are not something you can be judged for.

Follow up with your ID or Birth certificate and ask “Excuse me?”