Very cool Matt. (Hope your back is OK!)
I still ride on ocassion. My 250 Amateur Motocross days of the late 70's at Englishtown have way passed, but I still have a Kawasaki KDX 220 that I trail ride with... Nothing too tricky... Just staying upright is enough of a trick for me these days!
Here's one from 1979!:
I'm crouched down in front of the bike because if I remember right, when this was taken, the engine was on the workbench in the garage.
I have to admit that when I'm riding (these days) I feel young while I'm riding... but a few hours after I get off the bike... and things start to seize up (and I'm not talking about the bike), I start feeling really old!