I've only been riding a bike 3 seasons and am now 75 yo. I stretch regularly and have for quite a few years so I am quite limber. Stretching costs nothing and the benefits seem to be well documented. My purpose in stretching has been to maintain maximum mobility, which it has, but I find it feels good. Where I do experience difficulties is in recovery after a long ride but this is getting better slowly. These days I do 50 to 60 mile rides with one or two days where I need to rest up