So many questions to self answer first...aging out stinks!
I am a tad younger than you at 79 years old, and I developed that medical problem where the fingers start curling along with a touch of arthritis. It got bad enough a few years ago that the doc recommended that I stop shooting Magnum ammo so I sold the 357's, and the 44 Mag's and stepped down to my 9mm's and 38's and didn't really miss the full load maggies.
What a difference 4 years + makes!
In June of 2019 at 10 yards I could still put the 9mm's where I wanted even with crummy sights, but now at late 2023 I hardly get them on the paper. Eyesight is a little worse, shooting off hand standing a little harder to control weapon shake, etc. et. al. ad infinitum.
So....what to do? Give it up, turn in my range pass, sell them all and retire to the rocking chair on the back porch?
THEN... I acquired my first 5" S&W revolver, about a year ago. A 1921 HE in 32-20 WCF. Sheesh...this gun had a balance point that was better for my average, medium sized hands, just a natural pointer for me. Only problem was the ammo is just not anywhere to be found.
I was given 3 boxes of 32-20 ammo last Christmas, and then just happened to find a Model 10 no dash (1959) also with a 5" barrel!
Found a place to shoot lead ammo (banned from indoor ranges around here), took them both out just the other day and the minimum is 15 yards and I thought well...heck...I'll probably do a job on the support frames and get kicked out, but lo and behold..........these 5 inchers made me look 10 years younger!
In my opinion you need to answer some questions for yourself:
Do you reload and can you shoot lead at your range? If not then 38 Special will maybe your best choice for availability.
Can you rent, or does a friend have a 5" revolver that you can at least try and put a few rounds through to see about balance, POI/POA and feel in your numb hands?
What distance to target do you enjoy the most? Can you hold a 6" revolver steady in off-hand, standing for several cylinders (30-50) of shooting?
I have heard that prolonged shooting of 38's in a 357 may result in a build up occurring in the cylinder, don't know for a fact, but my 2002 Model 66-6 just nowdays sits in the safe unless my daughter is home and she likes the magnum rounds.
Do you shoot indoor or outdoor ranges or both. Outdoor for me because of lead ammo) means now wind and other (bright light/low light) sighting factors that I hadn't had to deal with in years.
I guess the moral is we all have issues to consider but anything that may help you keep doing what you enjoy with this shooting hobby is usually appreciable.
I wish you the best of luck in whatever you decide that works for you and please let us know how you proceed...age wise I'm headed your way so maybe some things you find may help me someday.
