Why does everyone in the US card everyone over something ostensibly about age?
It's never been about age.
I've seen a seventy year old man with a foot long white beard get carded and refused, while he was stone cold sober.
Do you think he can't handle his liquor? He's seventy. He knows what it does.
Congratulations, anon.
The link between citing your sources, for why you're thinking what you're thinking, and not copy/pasting said sources, is in fact fairly smart. Almost intellectual.