Economists who have researched happiness over a lifetime find it starts to decline after adolescence and noticeably dips when people enter middle age. How can we avoid the middle age blues and feel purposeful later in life? Arthur Brooks, behavioral economist and American Enterprise Institute president, uses eastern and western philosophies, classical music, and the latest research to give usable advice on how to be joyful throughout life’s different stages. It’s inescapable that we’ll grow older, so how can we develop new strengths as our life journey progresses?