Interesting article that suggests that a higher peak exercise capacity is an indicator for longevity. Good news for the active masters racers, eh?
The Stanford scientists involved followed up with each subject (all male, btw) up to 6 years later and found that after adjustment for age each man's individual exercise capacity was the best indication of longevity. The men with the lowest peak exercise capacities had almost 4 times the risk of death of men with the highest exercise capacities (and those men were rated with the equivalent of regular runners or fast cyclists with an aerobic capacity "better than jogging"). More here.