The others have given you much to think about so I'll offer three points no one else has touched on for your consideration.
If you choose a small revolver you don't have to have one with an internal hammer. You can have an external hammer bobbed so the hammer spur doesn't snag when you present the gun.
Too, you're not limited to .38s. My first love was a .32 Regulation Police (I-frame, square butt, six-shot), and I still like the caliber a bunch. There are also .32 Hand Ejectors (round butt -- maybe a bit more concealed carry friendly, but each person's opinion differs on that). I'm 65 and lucky not to suffer from arthritis or other ailments related to dexterity, but I have both model .32s (square and round butt) if I ever decide I can no longer handle the .38, .357 or 9mm revolvers. (I also have a .32 magnum, Model 631, just in case.)
A big decision maker for you might be to consider what type clothing you'll be wearing when you pocket carry. I always wear blue jeans (yip, that's an absolute!). I usually wear a vest, but none of my vests have carry-friendly pockets. Last fall I started to pocket carry an M&P 340 in a pocket holster in my left front jeans pocket. Although I practiced every day, I never reached a level of confidence that I could be fast enough or smooth enough to defend myself if the time came. Last week I gave up pocket carry, and I switched to 3" K-frame 9mm in a cross draw holster. I'm already faster and more confident than I ever was with the 340 in my jeans pocket. I don't find the K-frame too heavy or uncomfortable, and it's far more convenient when I'm driving.
Best of luck with your decision.