I wonder whether there is a measurable trend indicating that retrogrouches in the wild are increasingly confined to flats and valleys with their little cassettes as sarcopenia sets in, or if their bare boned grit will perpetually defy age and gravity. Any studies on this?
Nah, the great thing about being a retrogrouch is that your equipment really is better, which includes being more easily modifiable as one ages. It was easy and cheap for me to get down to 23 g.i. For studies, just look at the age breakdown for popular endurance events.