If you quit you're old...............
Just kidding, 65 here, broke ankle, ribs,hand mtb'ing.
I quit racing about age 60 enjoyed every minute of it though.
From the numerous bailouts ( voluntary and involuntary ) onto my right hip some arthritis has set up
there and in the knees, I'll need a new hip soon.
It's not if you're going to crash but when.
I still ride and enjoy mtb but without the pressure of racing the speed's lower the crashes are less and the wife's happier.