As you get older, it's actually nice to have some physical activities in your past which have always been done in a more low-key recreational fashion. It is somehow a lot less frustrating to do something considerably slower than you could have done it 10 (or 40) years ago if there isn't a history of having been working on how to cut out the last few seconds of wasted time in that particular sport. In retrospect, I can consider myself fortunate to have been poor enough in almost all of my sports other than running races on the road so I'm not particularly annoyed by (or often even aware of) the gradual decline in performance as I age, particularly since it is only the running that seems to antagonize my knees. Your pleasure in a more-or-less daily bike ride as a partial substitute for things like running, orienteering and golf seems highly rational to me!
That's one of the reasons I've mostly avoided nordic ski racing - the kind you do without a map, anyway. I don't want to do intervals or shave seconds from my turns or work on my technique. Skiing is just fun.