I am older than the fathers of a couple of you responders and I have kinda given up some repairs. I will say that I do have a couple of infirmities that require that I get help but I just bought a hobby truck to restore. I rebuilt an engine with my dad at ten, but this one is being done for me while I'm sitting at the beach watching the waves.
I'm also doing most of the little fixer uppers on the rig as problems arise. Of course you find those while you're on the road and it is easier to fix than find a mobile repair guy.
The biggest reason is while at the show in "Q" last month, I realized that when Vietnam vets call you SIR, you're getting older.