The Affordable Care Act (ACA) represents the largest reform to the U.S. health care system since the 1965 introduction of Medicare and Medicaid. Questions arise as to the possible effects of this significant health care change on the labor market behavior of near-elderly workers (workers aged 59 to 64, who are not yet eligible for Medicare). This grant supports a study by Mark Duggan and his colleague Gopi Shah Goda that examines the likely effects of the ACA on labor outcomes for these near elderly. Duggan and Goda will address several questions about the ACA, including how the ACA affects the employment, labor force participation, self-employment, wages, hours of work, and related labor market outcomes of older workers; which provisions of the ACA contribute to the estimated effects; and how these effects vary over time and by gender, race, ethnicity, marital status, educational attainment, and health.