Spike3 I reckon you're a bit off the mark with your average age guesstimate of early 30's, I'd say more like late 30's to early 40's as the average age, the poll will reveal all!
I decided I wanted to try BMX when I was 39 (although I had retired" from MX 4 times by and been racing DH by then). First time out I hit up the 12' halfpipe.......poorly.
I still try to get out and do some DH when I can, but I've been concentrating on other things.
52, and when I was in the granny ring and bog and 3mph on friday I felt everyone of those years. As I imagine I will in about 2hrs when we are in this wind on the Wolds.
I've hit the big 4-0 but don't think about it. Some days I feel 20 again but a few days after exercise and everything aches I'm sure the age 'feel' goes up to 60
It helps that I've a 5 year old boy and I've just been playing with Lego