My FIL is in his 70s and has had a few health scares- but you'd never know it.
He is the one who fixes the lawnmower, finishes projects that we find too hard to complete, and goes around on his tractor fixing the driveway, etc.
He brush hogs the back yard for us, makes us furniture, and on and on.
Actually he is more active than my DH and me put together.
He is smarter than about 25 normal people put together too. I cannot say enough about my FIL.
People in their 70's, they can do anything they want - all it takes is some pacing yourself and be kind to the bones.
Oh, and he is the one who chainsaws up my wood for me to split, after he hauls the dead standing logs from the back with his tractor.
You rock, sourland!!!