In 2015, Leland set out to meet members of America's fastest-growing age group: 85 and up. He anticipated learning of challenges, of loneliness, and of the deterioration of body, mind, and quality of life. But the elders he met lived with a surprising lightness and contentment, revealing the late stages of life as unexpectedly rich and the elderly as incomparably wise. Here are reflections on how to "live better"-- from those who have mastered the...