I'm 78 and I ride 40 miles a day in the summer months. I am sorry about whatever issue you have that you cannot ride any longer. The leader of the cycling club I was in 30 years ago had to stop because his knees developed arthritis. We all have something that throws a turd in the bucket. I was a runner before cycling but kept getting stress fractures. I ride because I love riding. Many years ago I played in a rock band and a guy that wrote a famous song for the Four Seasons bought a restaurant in town. Our lead singer knew where he lived and asked him to give us a listen and he did. He came to our practice place and worked with us to play some of his songs. Then he took us to New york City for a week (two still still in High school) to a recording studio where we layed down tracks for his songs. I was very good on lead guitar and the head engineer told me If I moved to the city and got a job to pay for a cheap apartment he would train me to be a studio musician. I was cute and in a band and someone got pregnant. In those days 1968, you married the girl and I did, but that put an end to that chapter. I played in bands for awhile but eventually had to get a haircut and a real job. I am still married to her and I love her. I moved on and so can you.
You are doing the right thing by staying fit because your health is gold. Find your next fitness chapter that fits you.
This is the best of of times for it.