Moo Goo wrote:
That is the nature of the aging game. You lose much more in the 5K over marathon.
Complete non-sense. As every master out there can tell you, you lose a bit of aerobic capacity every year (some studies say about 1%) + mileage is no longer your best friend due to wear and tear of a lifetime. Most people focus on longer distances as they get old which is kind of shooting themselves on the feet (pun intended). Those who focus more on other systems (VO MAX primarily), and work on their running economy pretty much every day with drills, hills, simple strides... can get some darn good results on shorter races up to 10k as they get in their 40s, 50s and even in their 60s.
Most of the guys who are now in their prime will never be able to experience all this because by then they will have been crippled by wear and tear and poor form...