Center for Demography and Economics of Aging at Syracuse University: http://www-cpr.maxwell.syr.edu/demogctr/demogctr.htm

National Aging Information Center: Demographic Trends and Projections: http://www.aoa.gov/NAIC/Notes/trendsproject.html

National Institute on Aging Demography Center: http://www.psc.lsa.umich.edu/agingmeta

U.S. Census Bureau Age Data: http://www.census.gov/population/www/socdemo/age.html