I can relate. I too have learned that some body parts are not as important as originally thought. Loosing some of them result in hugh scars and constant reminders that they are there. Other parts seem to slowly go south leaving one up north feeling kind of sluggish.
I received one of those eye opening comments from a young shooter yesterday. "Your that old and STILL doing this?"
I too let some things pass mostly by simply not taking game/predators where I don't think its needed. However, behind the house where the yotes out populate the deer I let nothing escape. It's fun to observe the whitetails and muleys raise their young after they get to keep them. I haven't shot a buck back there in years.
I have my MOA size gong on the mountain. May take the goats and make a first serious trip up there an see if I can ring it a little later today.