My father in law is turning 78 and still does 200km bike rides that I cant keep up with. He trains very dedicated about 5 times a week for the last 15 years. Which was the mOst surprising part to me. I always thought no performabce could be gained that late in life much less so much.
My father is almost 70, and going on hikes with him leaves me pretty winded. Certainly no walk in the park. I'm just a little more than one third of his age. If he would do some strength training in addition to his jogs and hikes, I imagine he would be in great overall shape.
I don't think that I'll necessarily be anywhere near his physical fitness when that time comes. But with retirement or a decreased workload, I intend to dedicate more time to keeping fit and treating my body as more of a temple.
With societies obsession over youth these days, it's gonna be interesting to see how the youth of today hold up in forty to fifty years.