chizelhead
WKR
I used to run and switched to road biking after I met a lot of older runners that had serious orthopedic issues. That was years ago, and the gear/training/knowledge is likely better now to mitigate that risk. I also found riding more enjoyable. There are usually organized rides (35,50,100, 200 miles, and multiday) and clubs in every area that can get you motivated at any experience level. I did both as well as lots of solo rides. Adding in mt biking was fun as well.