THE ART OF AGING WELL: PEEL YEARS OFF YOUR BIO AGE Live Online Your chronological age is the number of years you have been alive. It is a fixed number and cannot be changed. Your biological or bio age, however, is measured by how well your organs and body systems work. And there are many things you can do to affect your biological age. You have more control over how your body ages than you may think. Learn simple, scientifically proven things you can do right now to decrease your body age.