I'm 76, shooting a 40# Border recurve and a 49# Caribow LB. I shot a javi at LTR last year using the recurve but don't hunt or shoot near as much as I used to. On my string hand my ring finger locks up with too much shooting.
Last year I finally came to the conclusion that if I wanted to stay reasonably strong I needed to work out. Long gone are the days of passive exercise that gave me strength. No more racquetball, skiing, baseball, basketball and NO golf is not really exercise unless you walk and carry your clubs. ... I found an exercise gizmo of resistance bands called the Xfactor, costs about $100 on Amazon. Bands from 15,30 and 60#'s ... It attaches to a door so no having to go to the gym. I use it several times a week and it really works. I do about a dozen different exercises, mostly for arms, back and shoulders. I ride my bike for legs. Shooting my LB is now much more enjoyable other that my finger issue. It has also helped my golf game and my normal every day lifting and chores around the house.
Growing old ain't for sissies and keeping father time at bay takes a bit of work.