Study says 'Fitness Age' a better predictor of longevity

6abc.comStudy says 'Fitness Age' a better predictor of longevity6abc.comYou might think you know exactly how old you are. But you could be wrong. A new study suggests that a person's so-called fitness age-determined by cardiovascular endurance is a better predictor of longevity than chronological age. The good news is ...