AGING definition: 1. US spelling of ageing 2. relating to getting older: 3. used to describe a person or thing that…. Learn more. Learn about NIA, one of the Institutes of NIH, which leads the federal government in research on aging and Alzheimer’s disease and related dementias. Ageing is the process during which structural and functional changes accumulate in an organism as a result of the passage of time. The changes manifest as a decline from the organism’s peak ... You know that aging likely will cause wrinkles and gray hair. But do you know how getting older will affect your teeth, heart and sexuality? Find out what changes to expect as you age — and how to boost your chances of good health at any age. It's common for arteries to become stiffer over time.
