- The National Institute on Aging: One of the National Institutes of Health
- Administration on Aging: The U.S. Department of Health & Human Services
- The American Geriatrics Society
- The Gerontological Society of America
- The Merck Manual of Geriatrics: The complete version of this widely-used manual is online. It focuses on the medical problems of the elderly, providing clinical information to health professionals involved in the care of elderly patients. Many non-health professionals also find it useful. © Merck & Co., Inc.