I must be an outlier, 80YO, 20,000 in the book, short arse in stature, only problem is with both knees which I manage with exercises prescribed by my physio, one knee could probably do with replacement. Never found a problem with helo seats, usually the setting was pedals right back (short legs) and seat full up (to see over the coaming). Never did anything that required cockpit gymnastics such as long lining.
Spouse on the other hand is five years younger but crippled with spasms and pain in her legs, arthritis in neck and hands, two spinal operations, regular spinal injections due trapped nerves, has always been a home body with gardening, painting and sewing (daughter in ballet) as her interests, always told her her ailments come from a very active sporting career in her youth, but really its just genetics I think.