I turn 30 this summer, and my flexibility is the best it's been in well over a decade. A lot of rock climbing has contributed to that - putting my foot where my shoulder is to make a move up the rock requires a bit of contortion <img src="/ubbthreads/images/graemlins/eek.gif" alt="" />
You wouldn't know it to look at my beer gut, but I'm actually in the best shape I've been in since I was a teenager.