I turned 57 in November, also had a little health glitch this June, contracted Phnuemonia, which turned into Plurosy, spent a week in the hospital with a tube in my back lost 20 pounds and was weak as a kitten when I was released.
Worked hard to get back in shape and was chasing Elk in the High Country 6-7 miles a day at 10,000' by the first of September. Attitude.!! You can do things if you put your mind to it!
I am also back to shooting 60 + pounds on a regular basis,I have always worked out and kept myself in better than average shape.