The National Institute on Aging (NIA) is a part of the U.S. Department of Health and Human Services. It focuses on research related to aging and the health of older adults. The NIA aims to improve the quality of life for seniors through scientific studies and by providing information on aging-related issues. Established in 1974, the NIA supports various research initiatives, including studies on age-related diseases like Alzheimer's disease and Parkinson's disease. It also offers resources for caregivers and promotes healthy aging through public education and outreach programs.