I'm getting a little older too, but just a little . Speaking for myself, I hate stretching and do not have very good mobility. Stretching is very important for a number of factors - including having the mobility to look for cars behind, and being able to stay on the bike comfortably for a long time. There are a boatload of stretches you can do on line, a simple search is all you need to do. The hard part is putting the time in to get results.