According to CPS data on self-reported health status, "17 percent of persons age 55-64 have a work-limiting health problem compared with 9 percent of persons age 40-54 and 5 percent of persons age 30-39." (p. 32)
United States General Accounting Office. (2001). Older workers demographic trends pose challenges for employers and workers (GAO No. 02-85). Washington, D.C.: General Accounting Office. Retrieved December 1, 2007 from http://www.gao.gov/new.items/d0285.pdf
This report "analyzed data from multiple years of the Current Population Survey (CPS), the Displaced Workers Supplement to the CPS (DWS), and the Health and Retirement Study (HRS) and developed a projection method, based on BLS methodology, for estimating the age and occupational structure of the labor force and the relative wage structure in 2008."