You guys are not old yet, just on your way. Back in the early seventies, I was a young Highway Patrol sergeant. I had been a member of the regional pistol team as a Trooper and still had a lot of interest in shooting. Being the trained investigator, it dawned on me that not all gunfights occurred when the sun was shining and the birds were singing. My area's troopers thought that I had lost my mind, when I scheduled a training meeting late in the day with firearms training well after dark. We shot standard silhouette targets at distances out to 25 yards with only the glow of lights from a nearby small town, with flashlights, with one vehicle 50 yards back pointed to the targets, and with a vehicle with lights on parked at 90 degrees to the targets again back 50 yards.
The standard issue sidearm of the day was either the S & W 28 or the Colt Trooper (only a few), no such thing as night sights. The results were carefully recorded as to lighting and distances. Actually both the Troopers and I were surprised at the good scores recorded out to 15 yards. Most of the shooting was timed either rapid or just over a rapid fire rate and reloading was required on each string.
I felt this training gave my guys lots of confidence, and there after we only did the formal PPC type training as required for qualification by state policy. I wrote up the results and submitted them to headquarters and soon a very similar program was implemented statewide. our casualties went down and the bad guy's went up.
I tell you this to say this: Fun and games are one thing, but when you practice defensive training (to the extent your facilities permit), handicap yourself with lighting, and even without your glasses. If you are like me the glasses are the last thing off at night and the first thing on in the morning. But, I have reached for them on the night stand many times and they had been left on the dresser, or I fumbled them on the floor. You may even loose them in an altercation with an intruder. Prepare for the worst, armed with confidence from practice and instinctive shooting (pointing as opposed to aiming), keep in mind the FRONT sight is king, and cheat if need be. All is fair in love and war. These same principles apply to shotguns and rifles. Best wishes, jack