Im the same age as you, and Ive been noticing things are degrading at a rate quicker than I like. Ive worked and played outside my whole life, and from what the eye doc said, that can cause problems, especially as you get older. Just in the past couple of years, I seem to be getting a lot more, and larger floaters than I used to have, which are getting annoying, as at times they randomly and completely fuzz out any sight picture I might have with no notice. Its almost like recoil drives it while shooting too.
My last eye exam also indicated cataracts coming on. Not sure how thats going to go, or how fast.
I notice with my handguns, that getting a clear, sharp, traditional sight picture is becoming more and more difficult, especially with sights with a fatter front sight, like the Glock night sights, that have smaller gaps in the rear notch. I tried a set of Warren sights, that had a thinner front sight, and that was better, but they were all black, and only really worked well, in bright light, and for slow, more deliberate, bullseye type "lolly pop" sight picture, Anything with a dark background, and I lose the sight picture altogether.
Rifles, peeps are still the best bet, and more so now, the smaller apertures. Im OK with my AR's and the large ring at closer distances, but at mid to longer distances, I need that smaller ring to get a clear front sight. Its fuzzy with the large ring. It really is amazing how it sharpens up with the smaller ring too.
Awhile back, I discovered red dots are your friend. I much prefer them on most of my rifles.