The greatest longevity benefit that comes comes from improving your VO2 max is from people starting from a below-average VO2 max and moving anywhere above average. So, even going from below-normal VO2 max for your age group and gender to a low-normal is associated with a 2.1-year increase in life expectancy .... Going from below-normal to high-normal VO2 max is associated with a 2.9-year increase in life expectancy...