OK, I posted my reply, 55 now, 56 later this year!
I consider myself a "kid" in many respects (certainly my wife would agree w that!)
Anyway, wanted to share a brief story. A few years ago I was headed up toward Penner Lake, at the time leading a group of young backpackers. Along the way, (I was in the lead), I passed an older gentleman, reddish/grey hair-beard, obviously in his 60's minimum, who was coming out from wherever he'd been... he was solo.
I'll never forget that old guy... I aspire to be in my 60's / 70's & beyond & still be solo-backpacking in the Sierra!
He's kinda' my hero!