At a certain point you need to identify yourself somewhere. If I need to identify myself using a governmental certificate, that still means there's a database s

At a certain point you need to identify yourself somewhere. If I need to identify myself using a governmental certificate, that still means there's a database somewhere (which can be leaked/abused) coupling my cert to me personally. I work in software (for way too long, since the 90s) and as far as i can tell any system which can prove your age is at best pseudonymous and needs 3d parties to verify. Sure, you could create a scheme where only a 'trusted' 3d party has the link between you and your cert. But these days 'trusted' and government is not really a given, sadly. See trump.