Yeah the body ages and nothing can stop that, nothing will change that absolute. I will continue to do my best not to dwell on such things as I age. I will focus on my overall health and when I can no longer handle a two wheeled bike I will move to three wheels.
My brother live's in a sad state of mind, always thinking about his ailments, his aging body and fear of death consumes him completely. IMO that's so sad, he misses so much life doing that....
You get what you get so Get It On !
FWIW,
I am 56 years young and last week I was riding along with a group of late 30's riders, six of them..
Mountain biking,,
I was out front often