alcoholic's age

An airline crew describing a particularly annoying co-worker;
"How old is he?"
"Thiry maybe?"
"Oh no, honney he's much older than that."
"It's hard to tell with alcoholics"
"..Or with crack"
"...or astronauts"

I thought it maybe have been a UCB reference, but either way I started laughing out loud once the first officer came back with that quip.