Outside of general statistics age is fairly meaningless.

Some years back I was climbing a 14er in CO with some VERY heavy breathing 30'somethings who were most all in "good shape." A couple were needing some serious hand holding and encouragement though to forestall the "I-quit." About about 1/4 from the top in a massive scree field w/ HUGE unstable boulders (VERY tough going) I got a little unusual assistance for my encouragement efforts. Bounding like a billy goat down the scree field was a happy, chatty 70'something man breathing completely naturally and all with an 80s era steel framed road bike slung over his shoulder. Seriously... I was motivating the stragglers and just had to stop the guy to chat. Apparently that was his "thing." In his retirement, his fair weather fun was to ride to 14ers and then rip up and down them WITH his bike in tow. A bit nuts if you ask me but at mid70s he was a shining example of how little chronological age can mean...


added: BTW, shortly after on the same day/ascent we also encountered an above the knee amputee picking his way down from the top w/ nothing but a crutch and a partner. When one needs a lesson in perceived personal limitations, sometimes the cosmos have a funny and effective way of teaching....