I am in my late seventies, and quite understand your problem. Without my glasses on, I cannot even see the irons sights on my weapons. I have Crimson Trace laser grips on three handguns. I would not buy a handgun that Crimson Trace did not provide laser grips for -- that is a fatal flaw as far as I am concerned. I practice at the range weekly at five and ten yards, self-defense distances. I shoot some with iron sights but mostly with the lasers, because that is how I would do it in an actual situation.
The first time you use laser sights, you are going to be shocked at the way the red dot jerks around. That's you doing it, not the laser. Get over it. Concentrate on the target and trigger control, and you will soon be very pleased with your marksmanship. There are other makers of laser sights, but none of them operate as effortlessly as do the Crimson Trace version. The on/off button is quite instinctive, and quickly becomes an automatic reaction. And in a real life situation, do not try to scare the bad guy off with your laser. You would simply be announcing your location. If I ever light off my laser at a bad guy, I am about to open fire.
Cordially, Jack