63-Year
63-Year-Old Longevity Doctor Reveals 7 Diet and Exercise Secrets to Stay Young iStock Everyone wants a long lifespan, but nowadays, a long health span is just as covetable. Mark Hyman , MD, founder and senior advisor for the Cleveland Clinic Center for Functional Medicine and host of the popular podcast The Doctor’s Farmacy , put it best in an interview with GQ : “Your health span is how many years of your life you’re healthy, and your lifespan is how many years you’re alive....