Biological age, often referred to as “biological aging” or “biological clock,” is a term used to describe the state of an individual’s body and its functioning in relation to their chronological age. While chronological age is simply the number of years a person has been alive, biological age takes into account various factors such as health, lifestyle, genetics, and environmental influences to determine how old a person’s body truly is. In other words, biological age is a measure of how well or poorly a person is aging, independent of their actual age in years.