mary the reality is that if you are passionately involved in something you love doing you generally dont decline. ....well no where near as fast.
I once had a bunch of women on the airfield complaining bitterly about their hubby's being interested in aviation.
I pointed to a group of old pilots and asked how old they were.
when I pointed out that the guesses were about 20 years too young I asked them if they'd like their hubby's to be as active as that at the age.
for some odd reason the complaining stopped.
a lot of people age at the rate they expect to and not at the rate their bodies are actually ageing. keep on flying for as long as you want.