I'm 30, which seems to place me almost exactly in the demographic center here. Funny, back when I started playing in the 80s I always felt like most other players were a lot older than me. But then, the 6 years' difference between 30 and 36 seems pretty trivial, whereas the 6 years' difference between 10 and 16 or 12 and 18 are a lot more significant...
Related story: found out today that one of the girls in my office went to the same college as me (which is unusual because it was a liberal arts school with only ~1200 students). However, I was in the class of 1997 and she was in the class of 2004, which caused her to cheerfully announce "hey, when you graduated I was a freshman in high school!" No, that didn't make me feel old...