We will all be there some day. It is just a fact of life. I feel for you. I shot 55 bows most all of my life. Now I am down to 25 to 35 lb bows. Not from muscle strength, but from bone joints. What Pat said.
Yeah, I had a lot of elbow trouble. A while back I found I couldn't even do one push up

Gradually got back to doing 12 but with my knees on the floor. A good thick neoprene elbow support helps while shooting.
I really wanted to use my flight bow to push out my PB.
Its hard work keeping even passably fit.

Keep on keepin' on guys.
Del