Arthritis is starting to affect my shooting. I had been thinking I might retire from police work by late 2015, largely because it was becoming painful to shoot my SIG P229R, .40 S&W, but three things have helped prolong my serious shooting. The first step, involving two of those three factors, was made possible when my chief authorized 9mm to be an alternative duty cartridge, so I switched to Glock, for the lower bore axis, at the same time I switched to 9mm. I could have stayed with SIG, switching to 9mm, but I remembered, from the time I still had a .40 G22, that a high bore axis was a significant factor in muzzle flip, in spite of the SIG's greater mass/weight. The flexing polymer frame of the Glock pistols probably play a part, too.
The other thing that helped was resurrecting my carry of heavy steel. I started carrying my one remaining full-sized 5" 1911, a Les Baer Thunder Ranch Special, during personal time. (I can shoot a 1911 better than a Glock. No amount of training with Glocks closes the gap.) A 1911, especially one with a high-cut front strap and relieved trigger guard, as made by Les Baer, has a quite low bore axis, and .45 ACP, while it may have quite a bit of recoil, seems less "snappy" than .40 S&W. I am very glad to still be able to carry a 1911, the original foundation upon which all of my handgunning was built.
In 2016, my chief authorized those of us who attended a transition/certification class to again carry the 1911 as a primary duty pistol. It seems that most of the older firearms training officers, many of whom are arthritic from so much shooting, are now toting 9mm 1911 pistols. (I work for a very large PD; our larger qual/training range is open 24 hours a day, five days a week, to keep 5000+ officers qual'ed, so there are quite a few full-time range personnel.) Someday, I, too may acquire a 9mm 1911.
Another thing that helps me is attaching a Surefire X200 or X300-series light. This makes a G19 noticeably more comfortable to shoot. Simple, really; mass provides the inertia to help damp recoil, and hanging the weight under the muzzle reduces muzzle flip.