Life is full of continuing changes. I can tell you they get harder to take as time goes on. I can tell you my last century was by far my toughest yet. I always enjoyed solo rides more, as it gives me more freedom to be myself. That is to go where I please, stop when I want to, or "need" to. I can do intervals when and as often as I want, you get the idea. The aging process affects us all at different degrees, and at varying times, but we all need to realize that time marches on weather we like it or not. I think embracing it is much better than fighting it, but I haven't really learned how to do that very well yet.