richardw -
I'm with you in the age and arthritis department. I tried pocket revolvers, but they don't conceal as easily as a flat semi auto. I've gone from 1911 commander to a duty size nine to a S&W 638. I'm now down to a .380 Sig P238 because I can work the slide with my arthritic left hand. It's gotten so bad, all four of my left hand's PNP joints have gone solid and I can't close my hand or make a fist. I tried the 9mm P938, but its heavier buffer spring and magazine springs are now beyond my capability to manipulate reliably.
So I adapt and overcome, just like you have. The immortal words of Staff Sgt. James Monroe Uptagrafft ring in my ears still
"Men, you don't have to like it; you just have to do it."
Keep on truckin'!