www.aafp.org/nsi - Take a Nutrition Screening Initiative sponsored by the American Academy of Family Physicians, the American Dietetic Association and the National Council on Aging. The checklist offers a list of warning signs that diagnose poor nutrition in elderly people. For every dollar spent on nutrition screening and intervention, at least $3.25 is saved in health-care costs.

www.bumc.bu.edu/departments/homemain.asp?departmentid=361 - For an overview of the New England Centenarian Study, go to Boston University's Web site. There's also information about how to participate in the study.

www.livingto100.com - It's not all good genes. Take a quiz to estimate your approximate longevity based on hereditary traits and lifestyle choices.

nutrition.tufts.edu/pdf/pyramid.pdf - Here's a modified version of the USDA's Food Guide Pyramid issued in 1992. Three researchers at Tufts University modified the pyramid to reflect the nutrition and hydration needs of 70-plus adults.