zero-knowledge proofs
the point is non-govt entities shouldn't get any information about you during age verification other than that you're over 18 and that's what ZKP can give you
I'm sorry, you can't just drop "quantum computer", or "zero knowledge proof", or "flux capacitor", and think that you have solved the problem.
Just dropping "zero-knowledge proof" as if it's a mic drop moment is like when Turnbull said "the laws of mathematics are very commendable, but the only law that applies in Australia is the law of Australia".
The devil in all this is in the details. Just saying "zero-knowledge proof" is just barely more productive than saying "won't someone please think of the children?".
If you don't have a complete solution, then you're "not even wrong".
In addition to that, you have misunderstood how zero-knowledge even addresses the main problems. Not the technical problems, and DEFINITELY not the meatspace problems.
Second: There was some substance. Maybe not six paragraphs worth, but there was some. Here it is: You, when you said "zero-knowledge proofs", did not give much substance. How, specifically, is that going to work?
It's a bit rich for you to be complaining that knorker didn't have any substance, when the problem is that you didn't give any.