As the health of the U.S. population improves and the sources of retirement income become potentially more unstable, older Americans are expected to continue their current trend of both needing and wanting to work longer.  The health impacts of longer working lives, however, are inadequately understood, particularly when work is induced by policy changes such as increasing the age of full retirement for Social Security benefits. This grant supports research by Maria Fitzpatrick of Cornell University and Timothy Moore of George Washington University that examines this issue by studying the changes made in 1983 to the statutory retirement ages for Social Security benefits.  Combining administrative with data and detailed data on health behaviors and expenditures, Fitzpatrick and Moore will examine how and whether differences in the length of working lives change health outcomes such as mortality and morbidity.