I KNOW that I am in better shape than I was in my twenties and certainly in my teens. I was never much of an athlete and was lousy at most sports as a kid. I was in my late 20s when I realized I wasn't in good shape and began working out at the gym. Also I don't smoke anymore. Now, with the gym and running and cycling, I am in ten times better shape than I was 20 years ago in high school!