Every year, the Purpose Prize rewards social entrepreneurs over 60 who are taking on society's biggest challenges. Prize-winners Sharon Rohrbach and Jock Brandis talk about their contributions to society, and career counselor Carol Vecchio explains how to pursue purpose in later life. Then, Harvard professor Sara Lawrence-Lightfoot discusses her new book, The Third Chapter: Passion, Risk, and Adventure in the 25 Years after 50. Legendary editor Sir Harry Evans explains how a lifelong pastime keeps him feeling young.