Since Retro Grouch didn't bring it up, I will. It's the dreaded word recumbent. I went through the same scenario 19 years ago. The older I got, the less a diamond frame bike worked for me. My main ride for years was a top-of-the-line Motobecane Le Champion road bike. It fit me perfectly when I was much younger but became torture on long rides more recently. I tried a suspended MTB and even added a stem raiser to reduce the pressure on my hands. It was a waste of time. I finally bought a used Linear long wheelbase recumbent bike for $500. It was a tough transition at first but I managed 3K miles on it in the first 11 months.

There is another thing to consider. It is cyclists palsy, a version of carpal tunnel syndrome that cyclists get from compressing the nerve that crosses the palm when holding on to the handlebars. Mine was so bad in 2000 that my hands would go numb after riding as little as 15 miles. It was a major reason for switching to recumbents where there is little pressure on your hands. Unfortunately by the time I switched I had done too much damage and recently had to undergo carpal tunnel release. It is a good reason to not continue to do something that may be harmful in the long run.