How to live to 100
National Geographic writer and explorer Dan Buettner studies the world's longest-lived peoples, distilling their secrets into a single plan for health and long life. To find the path to long life and health, he and his team study the world's "Blue Zones," communities whose elders live with vim and vigor to record-setting age. He shares the 9 common diet and lifestyle habits that keep them spry past age 100 here.