I know you don't generally care to tour like I do, that is, I'm the King of the 1-2 week tours, a half dozen or so a year. But what I have found so frustrating is that when I hit my mid 60's is that my average speeds just continue to diminish. It's not like I'm not trying or that I've put on extra weight but the legs won't do what they did even compared to my mid 50's. And because of that, I simply can't cover the same amount of ground that I once did which forces me to shorter mile days which affects one's daily choices or options. That stinks but I continue to remind myself that almost no males with my Y chromosome have ever lived to be 70 so it could be worse : )