I was 21is at join time, now 22. Be 23 soon though.
I figured most here where in the 20s. Didn't someone in their 40+ years join sometime? And IIRC Nebuzner or what ever his name was, was in his 30s. The guy that posted vuln sites a lot and loved beer as much as me.
Also judging by some member intros we've had as young as 8ish, but if they don't stick around and at least contributed to the random section I don't really count them.