As a 59 year old personal trainer, let me assure you that most people can have darn good shapes if they want it, well into older age. I like to run 5Ks and I’ve seen 90 year olds finishing the races. And look at Jack LaLanne in his later years. :-D He finally started losing it in his 90s, and even then he was doing great for his age and he looked good.
We moved to KY from Seattle three years ago. I’m almost 61. People’s first reaction to how old I am has almost become comical. Now I just say that 45 years in the rain is the reason.
Truth be told, it’s genetic, and I bicycle commuted between 25 and 45 round trip miles (depending on the contract I was on) until cell phones made it too dangerous.
My 86 year old father left the softball team a couple of years ago, but he still does a lot of wood chopping.
And my 87 year old mother still has black hair with a few gray strands.