I strongly oppose any form of "age verification" involving uploading your ID. That's just asking for a data breach.

There are options that don't involve any ID uploads whatsoever.

That's not what this user was talking about.

For example, with a German ID you can provide proof that you are older than 18 without giving up any identifying information. I mean, nobody uses this system at the moment, but it does exist and it works.

Does the German ID system know what you are trying to access? Based on the requestor.