With the health issues and other things being considered, is it possible to ride on paved bike trails? Do you know anyone who is a regular rider who can help you pick up a good used bike? Shifter problems are a distraction. Getting good components is very helpful. A good used bike with better components is my choice, but a LBS is always a good resource to have.

My preference is riding trails because I don't like competing for space with the petro burners. That being said, so far so good. But I did recently surprise myself when I flipped off a driver who cut me off. I haven't done that in 40 years.