Administration on Aging, U.S. Department of Health and Human Services: http://www.aoa.gov/index.asp
National Institute on Aging Information Center: http://www.nia.nih.gov
National Guideline Clearinghouse/Agency for Healthcare Research and Quality. http://www.guideline.gov/whatsnew/whatsnew.aspx
United States Department of Health and Human Services: Aging: http://www.hhs.gov/aging/index.shtml
Last updated - January 2005