I am 77. In local matches with RFRO I generally finish in the top 10 overall. My eyesight is very mature! I don't shake much with the rifle, but pistols are a different story.
I have a standard for accuracy called, "One Minute of Paper Plate." I set out a target with a paper plate on it at 17 yards. If I can put 5 shots on the plate quickly, I consider the rifle sighted in.
I do the same for USPSA PCC and pistols. I mostly shoot PCC in USPSA, but lately switched to single stack just for fun. I am just not fast enough on my feet now to excel at USPSA (I made Limited A with a .45 high cap back in the early 2000's) to excel anymore. I think I enjoy USPSA more now that I don't care how I do. (That was an official lie - I do like to finish in the top half).
That said, I find Steel Challenge to be more fun. I just replaced my right knee. Left knee to follow later in the year. I will still be able to shoot steel even soon after the surgeries, since I don't have to move.
In the words of my gunsmith, "The older I am, the better I used to be."
Shooting is just so damn much fun!!!!