The number of Americans eligible to receive Social Security benefits will increase from forty-five million to nearly eighty million in the next twenty years. Retirement systems must therefore adapt to meet the demands of the largest aging population in our nation's history. In Developments in the Economics of Aging, David A. Wise and a distinguished group of analysts examine the economic issues that will confront policy makers as they seek to design policies to protect the economic and physical health of these older Americans. The volume looks at such topics as factors influencing work and retirement decisions at older ages, changes in life satisfaction associated with retirement, and the shift in responsibility for managing retirement assets from professional money managers of traditional pension plans to individual account holders of 401(k)s. Developments in the Economics of Aging also addresses the complicated relationship between health and economic status, including why health behaviors vary across populations and how socioeconomic measures correlate with health outcomes.