In reply to UKC Articles:
One of my earliest climbing partners, beginning in 1968, faded from contact as years passed. He was a no-show at my 50th high school reunion, but I'd found an email address, and wrote with information about other old friends re-connected.
I was disturbed at his replies, because he was rather vague, but far more, he had absolutely no recognition of several who we'd been on road trips with - even when I included a short, humorous video clip of one of the most distinctively eccentric ones, recounting a tale in his unique voice and countenance that had changed little over the years.
I had to conclude that my friend was no longer the person I'd known, and that he was likely slipping into a mental decline from which there was no recovery.
How we age is partially within our control, partially who we've become, and partially beyond our control, by genetics and the vagaries of health, illness, and the lives we've built.
In the end, the numbers become incidental, and trying to retain "hard man" credentials really only ends with being at best a curiosity, what I call a "glacial erratic," or at worst a laughable anachronism. Be kind, share bits but don't overstay your welcome; appreciate the young who respect and appreciate you, and politely ignore the ones who don't.