I have been where you are now. Get used to the fact that you now have fixed-focus eyeballs. You may still have to wear glasses for the astigmatism, if its bad enough, but this is not all bad: you can have a correction put in one lens to allow you to focus adequately on your front sight. What I have done is get some
stick-on bifocal lenses (one example of many) and put one on my shooting glasses but not at the bottom where you'd normally expect a bifocal lens, but at the top of the lens, where you're looking through it when focusing on your sight. You'll never have the adjustable focus you had in your youth, but you can adapt and manage.
You can always go to a scope, but if you are like me, you mostly prefer iron sights. Another solution I've found is the
MISO lens. This was originally developed for the M1A and is legal for service rifle competition, and gives just enough correction to focus on the sight. In the photo below I've placed one in what was the adjustable peep on a No.4 Mk1 Enfield. It works! I can see the sight and the target adequately at 100 yd.
I later installed one in the battle sight (replacing the elevation-adjustable sight which I always kept at the bottom anyway) for a simpler installation. You may be able to adapt something like this to your rifle(s).
I still shoot irons and pistols with the upside-down bifocal glasses described above, but the MISO lens is an elegant solution where you can use it. Like you, I went through a period of being unhappy that my shooting would be affected (some might say "not so you'd notice"), but at least now I can be out in the woods without glasses, or with my choice of sunglasses, and I've adapted to the rest. Is it perfect? No; never gonna be. Can I live with it? Heck yeah.