I know your pain - turned 50 and now I need readers for anything in arms reach distance. I need readers to focus on the iron sights and that makes the target blurry, and if I just wear normal safety glasses the target is in focus, but the sights are blurred.
I am practicing more with a variety of steel targets sizes and regular glasses. If I hear the steel I know I am good and I move to a smaller size target - kinda of KYL where I know my own limits. The downfall is less accuracy but quicker target acquisition.
The other method I work with is SSP Eyeware top focals - basically a bifocal with magnification on the top (as I tend to roll my head down a little despite knowing I shouldn't) and no magnification on the remainder of the eyeware. They are fully ballistic rated safety on both parts and have interchangeable lenses between clear, amber, and smoke. The downfall is longer target acquisition time but greater accuracy.
Either way is going to take a lot more practice and the advance knowledge that I will never group as well as I did when when I was younger. As long as I can kit a torso sized target on every trigger pull at distances upto 60 yards (the total length of my backyard range) I guess I am doing well