What does social responsibility look like after age 50? In this panel discussion, sponsored by the Stanford Center for Social Innovation, academic experts talk about how they've found meaning in their own lives, and what their research reveals about how others may take advantage of a long lifespan to make purposeful contributions to society. How is the new move toward "encore" careers helping people find motivation in the second half of life, and how are economic realities impinging on the dream of unlimited opportunity?