I started when I was 17 (less than 1 year ago, october-ish) and I can't get enough of it. Started with a KDX220, raced my first desert race in December (2 months after I started) and continued on. I'm now on a CRF450R with 8 or so races under my belt. Mind you, none of them are strictly MX but they include AMRA, Best in the Desert, ISDE Qualifiers, WORCS and a few other little ones. You're never to old to ride! My dad is 50 now and rides when he can. Get out there and enjoy it! :D