Three universities and a government research organization are in the top 10 of the 'best US employers' list for workers aged older than 50, as compiled by the AARP, formerly the American Association of Retired Persons. Cornell University in Ithaca, New York, came first, the US National Institutes of Health third, Massachusetts Institute of Technology seventh and George Mason University of Fairfax, Virginia, tenth. GlaxoSmithKline at Research Triangle Park, North Carolina, debuted this year at 25. The annual survey, launched in 2001, cited retirement benefits such as health and life insurance, job training and placement for older workers. The list is at http://go.nature.com/h42oIj.