In my 60's now with lineless trifocals and some floaters in my eyes I could not do that well either
In my middle 50's with bifocals.
The trick for me is to shoot with no corrective glasses, just safety glasses.
the target is something between a blur and a blob, but am able to fix on the bottom of it and get a clear view of the front and rear sights on the pistol with arms extended.
Ironically, I am not able to use iron sights on a rifle to any good accuracy because the rear sight is way too blurry. an aperture sight might work, but I do not have any.