The referenced article lost me as someone who thought it might be credible as I read: "The January 2009 issue of Exercise and Sports Sciences Reviews investigates the entire world's literature to show that endurance improves as you age." This simply can't be an accurate statement. Hence, any other claims made are subject to an evaluation of their accuracy. I agree with Cyclezen on this one. I'd like to read some of the actual studies on the issue. While we (the collective 50+ posters) may want to feel good about ourselves, let not become stupid in the process.