71 here. I have been active my whole life, but never weight training or anything like it. Farming, working in the woods, cycling, running in my youth. These days I try to ride every other day. I do hand tool woodworking which keeps my upper body moving. And I still enjoy digging, with a mattock and a shovel. I would like to do a stretching routine, but it hasn’t yet come to pass. I also have minor heart issues.. I did not watch the opening video. I believe I am nearly as strong as I was 20 years ago. My early fifties were a peak time for strength. Living in the rainforest of southern Belize, farming and operating a pole driven dugout. I do get winded a lot more easily these days; that is the noticeable thing.