Since Apple recently added the ability to store state-level identity documents in Apple Wallet (IF a state/country is on board), it's not a big leap to combine this with Face ID.

If Apple can perform a digital attestation of a derived attribute, e.g. "older than 18", rather that disclosing name, DoB, address to the visited website, it would likely be well received.

But at that point, we're a hair's breadth away from state-corporate fusion.