30+
It depends on the club, though, and their reason for being there. I don't see why a 30+ year old couldn't enjoy a night out at a club every once in awhile. BUT, if we're talking about regulars, 30 is just way too old. You need to get your **** together if you're going clubbing every week when you're over 30.
Also, I'm kind of disgusted when I go to a gay club and a third of the people are old enough to be my father, and all they do the entire night is bitch about how they hate the music. And some of them tend to be extremely obnoxious when they drink and try to feel the young guys up.

No ma'am.