The human survival instinct prods us to outlast afflictions and, if circumstances permit, to reach old age. Nothing, of course, could be more quintessentially natural than aging. Physician Andrew Weil gives his views on healthy longevity in which older people come to accept the challenges and discover the rewards of aging, plus a look at Okinawa home to the highest percentage on earth of people who live to be 100.

To see additional resources and our other programs, please visit humanmedia.org . Humankind specials are  heard on NPR and PRX member-stations, in association with GBH Boston.