What do people my age do?

[brainfizz]

I'm going through a moody, introspective phase at the moment because I'm about to hit the big 3-0 yet everyone I know is 18-21. It's a nightmare, but for the last 10 years or so, everyone I know has been in that same age bracket.
I keep moving from town to town and taking up new and interesting hobbies, thinking that I'll finally figure out what late 20's early 30's people actually do, but whenever I start a new hobby, I find out that everyone at that particular club/group/whatever is about 20, if not younger.
It was great in my early 20's (loads of people my own age), pretty damn good in my mid 20's (loads of fit girls smitten by me), but now I'm a bit old for the girls, too old to go round to friends houses when they live with their parents, too responsible to play silly buggers with them, I just want to find some people my own age.... but where???
So I come to you, my fellow dopers, to ask a quite simple question - what do people 29-30 actually do? Where do they hang out? Where can i meet someone my own age? (bear in mind that I'm quite shy and I'm in training to be a policeman, so I probably can't do anything too extreme!)