I just dropped back in to say hi. I think I'm 8.5 years after getting my pig valve (Hancock II) and some repairs. I just turned 74 and I've still been pursuing a crazy active lifestyle:
I got out to play PICKUP INDOOR BEACH VOLLEYBALL about as often as ever, maybe 15 times this winter! Mostly 4-on-4 with a bunch of 20- and 30-somethings, but sprinkled with some wonderful 2-on-2 matches thrown in (including some 2-on-2 wins, which is tough in that crowd!).
I have 3 Whistler SKI week timeshares, and I skied all 18 days pretty aggressively. Conditions were never "hero snow", but in late March I finally finished the week with 3 days over my mental benchmark of 20,000' of vertical. A year or two ago I mused on Facebook about switching my benchmark down to 18,000' of vertical, but those 3 days showed me that I was falling short more because of slow conditions (heavy snow, silly late starts) than age and deterioration.
I've stayed active and successful in SAILING AND RACING LITTLE (15') DINGHIES. In addition to training a lot of newer sailors, I managed to regain my club's top racing skipper spot after 3 years of getting beaten. One of the guys who'd beaten me moved away, but I had to beat the other one fair and square.
BICYCLING: I don't take serious bike trips these days, but I commute locally (e.g. to/from the sailing club) as an urban cyclist. No mountains, but the city slopes down to the lake, so cycling back home while tired from sailing is a workout.
I call it all "doing my best to age gracelessly". I know I can't keep it up forever - or even very long - but I'm loving and appreciating it for now, one experience at a time.
Mentally I'm still relatively unimpaired, though I do find myself taking an extra "beat" to find the right word. I don't think the AVR has much to do with that.
Good luck all, and keep doing what you can,