Biological Age vs. Chronological Age

Topic

Chronological age measures the exact amount of time a person has been alive, whereas biological age (or physiological age) refers to how old a person's cells and tissues appear based on physiological biomarkers and molecular health. While chronological age increases at a constant rate for everyone, biological age is highly variable and influenced by genetics, lifestyle, and environmental factors. Scientists measure biological age using tools like epigenetic clocks, blood biomarkers, and physiological tests to better predict healthspan, disease risk, and mortality.