I've never been an athletic. Ever. I wish I was. I've done double centuries very slowly and ridden multi week supported tours with many mountains, again, very slowly. I bike commute daily and if I count that (and why wouldn't I?) I hit 7000 miles last year.
At 65 I wonder how much longer I'll be able to do it. I'm on a downward trajectory.
I've noticed I've lost power and pop over the last six months. I fear the end is approaching.
So who knows?