@bob_zim : apart from the fact that online age verification can be easily bypassed, I expect online authentication (proving your identity as known by your government) to lead to massive numbers of identity fraud.
Reliable authentication necessitates that the VERIFIER is trustworthy. If not, they can impersonate you to a third party, using the digital proof that you provided.
Suppose you prefer watching sex with elderly women, and google "milf sex".
And suppose google comes up with rollatorbabes dot com. You go there and they demand that you prove you're old enough by sunmitting your electronic ID - and perhaps also a selfie "to prevent fraud". This may happen:
You <-> RollatorBabes <-> Visa
RollatorBabes forwards all auth details, except your home address (RollatorBabes changes that) to Visa - in order for them to obtain a creditcard - showing your name.
To prevent this, the first thing you need to know is WHO the verifier is. Not who they say they are, but reliably verified by a third party who deserves YOUR trust. So you can sue RollatorBabes if they fsck you.
Do you trust THEM, shown below?
See also https://infosec.exchange/@ErikvanStraten/113880125384919871.
@nazokiyoubinbou @evacide