Kendall K. Morgan, Ph.D., writing last year for the National Institutes of Health, highlighted Health Octo Tool and the Body Clock:
[P]eople of the same age can show vast differences in overall health. Some have multiple chronic conditions affecting various parts of the body by midlife, while others have a clean bill of health into their 70s and beyond. One theory holds that such differences stem from variation in biological aging. This is the extent of damage that builds up across tissues and organs, leading to chronic conditions, physical decline, and disability.
Existing measures of biological age, such as the Frailty Index, try to capture a person’s health based on the number of health deficits they have. But these approaches don’t fully capture the complexity of biological aging. A research team led by Drs. Shabnam Salimi and Daniel Raftery at the University of Washington School of Medicine and Drs. Luigi Ferrucci and Marcel Salive at NIH’s National Institute on Aging wanted to develop a way to better capture a person’s health and rate of biological aging.
You can read more on the National Institutes of Health website.