This is a very interesting topic. I am turning 62 soon, and "aging" is really on my mind.
I recently went from 60# and 65# down to #50. I am enjoying shooting my bow so much more.
I also hit the gym at least 3 times a week, often 5x. It is a local gym that has a variety of workout programs, and I do a a version of "crossfit light" and I box. I have it in my head that I am training for bowhunting and for "my last decade". I am still carrying an extra 20# but thats diet.
My plan is to keep my arms, back, and shoulders healthy so that I can pull a hunting weight bow as long as I can.
A lot of this stays in my head because of my friendship with Ron LaClair. Ron was a beast of a man in his prime....often hunting with 90# and 100# bows. Well into his 70's I watched him hang treestands, unstring heavy bows while sitting in a recliner.....he was very strong.
I was with him when he shot what I believe was his last arrow. We had just pulled into ShrewHaven. Ron's health was failing...honestly I was irresponsible for taking him up to camp. We got out of the truck and he sat on his chair on the porch....he asked me to string the bow he planned on hunting with. I watched him struggle to pull back that light, 30# pound. He sent a perfect arrow....probably 25 yards to the target and dead on. But that was it. His muscles were failing. He couldn't draw it again.
Watching him struggle with what he would have called "a kids bow" kinda haunts me.