What do you mean if you can do age you can do identity? If age is self-reported that's not true. Or if you need strong validation, ZKPs are possible where it is also not true.
what is most likely in play, as we have seen in other identity schemes, is that the cryptography will be sufficiently opaque that experts won't be able to reason about it until after the products are forced on people, or, they will just accept junk protocols and use the law to shift liability to the user to comply with identifying themselves truthfully on the internet. the other scenario is if the protocol provides strong anonymity, it will use a bunch of new primitives without mature standards that happen to have escrow access built in.