I'm about to turn 75 and doing as well as anyone sounds like.
I've found "gardening knee pads" are a big help to keep from hurting the knees on the concrete garage floor. And I use a lift for working on the old British Triumph motorcycles but have no room for a lift for the '31 Tudor.
The best exercise I've found is hitting the honky-tonk music places in EastTennessee/SouthFlorida/Louisiana but not many are open now due to Covid
So, walking the Pyrenees shelter dog on the beaches here around Charleston, SC is good exercise now. And my sweet wife lets me drive her Porsche too, to keep a smile on my face