I can think of a bunch of governments who would love that. Most are considered totaliarian.

So... you can't win.

Theoretically, if you did trust your government, couldn't zero-knowledge proofs be used to allow such a system? I am a dunce about this stuff, so genuinely asking.

Example that seems like it should be required for all age verification systems, if linkability is addressed:

https://blog.google/innovation-and-ai/technology/safety-secu...