Here's what I found out!
First off, Good luck, it should be fun for you!
In '88 I broke my leg REALLY bad, tore the knee completely up, racing MX. Was told that the best thing was to take the leg off, (the bone below the knee was in tiny pieces). Well, an old Army doc, saved my leg. 3 long years of rehad until I could almost walk normal.
I was off bikes until '97.
I ride with 2 knee brace now.
I went back into Hare Scrambles, they are a lot like a MX race only you ride through the woods, a lot more phyically demanding cuz of things on the trail and the time you ride, (2 hours). Speed can be fast, (I ride in North Eastern Pa, dist. #6)
I tried enduros also, (no more MX,SX for this 'ol fart!).
They are like a faster trail ride. ride long distances, 60 plus miles.
Thing in both, you can ride to win, ride to compete, ride to have fun.
Just stay out of the, "serious" guys way and you'll have a blast!!
I'd get a bike with nice mellow power, (I run a ATK 250, GREAT suspension, lots of low end grunt), so you don't have to work hard and keep your legs down on the ground.
I ran a 125 ATK until the end of last year, they're fun, light weight, flickable in the woods, but if you get in a power robbing place, (sand, mud, rock garden), you like a little more cc's.
They say the KTM 300 is a great senior bike.
I've tried a '98 KTM 200, but nothing could match my ATK for suspension.
Just to go out on the line and race is a rush again!!!!!!!!!!!!!!!!!!!!!!!!!!
You'll have more fun just doing it now than when you took it serious.
I pack my fanny pack, help out my 2 sons out there with me, racing hard like I used to, plus some of my friends kids, hell, anyone who need help, I stop. Then I hop back on and ride. I can run with the big dogs when the need arises, but most time it for me.
Good luck!
Joe
Sticks and stones may break my bones. That's why I run into trees and rocks!