On the other hand, maybe your interests are just changing a little. You express an interest in more easy paced rides - maybe touring would be an alternative.

When I was in my 20s/30s I was an avid SCUBA diver - wrecks, ice dives, night dives, whenever I could. Then I switched over to downhill skiing and that crowded out the winter diving trips. In my late 30s, and 40s, windsurfing took over and crowded everything out. In my 50s, I regained an interest in diving and recently (58) cycling is ascendant. I have three sailboards sitting idle in my garage at my weekend house on the water and it amazes me that I just don't feel up for rigging the sails and going out - I would rather jump on my bike. Go figure.