New England Centenarian Study: http://www.bumc.bu.edu/Dept/Content.aspx?DepartmentID=361&PageID=5924
The NECS has gone on to enroll centenarians from throughout the United States and other countries and has grown to be the largest comprehensive study of centenarians in the world. There are currently 1,500 subjects to-date, including centenarians, their siblings and children (in their 70s and 80s) and younger controls.