Hello Rifleman,
Many of us are in the same boat as you.
The years are creeping up on us, and we still want to shoot.
As we get older, we loose muscle mass. If we want to shoot off-hand we have to practice weight lifting.........but that is a losing battle.
If we want to participate and be fairly competitive we need a rest, cross sticks, shepherd's stick, or even a tree branch, there is NO shame in that!
If those supports are unfair, I suppose glasses are as well.
I am now past 70, and realize I'm not the young buck I once was, But I still get up before sunrise and work in the shop till almost midnight.
Better than many younger people.
So give me my rest and get out of my way before I squeeze the trigger.
If you need a rifle and a rest to hold it give me your parameters and I'll see what I can figure out.
Fred