Americans have been living, generally speaking, longer and longer. What makes for a good old age? How should we think about the changes that accompany our later decades? For this week’s podcast, we spoke with Louise Aronson — a geriatrician, writer, and professor of medicine at the University of California San Francisco — about her book Elderhood: Redefining Aging, Transforming Medicine, Reimagining Life, out June 11th from Bloomsbury.