Biological age is becoming critically important to gauge a person’s overall health. It is a more accurate predictor of disease risk, healthspan (years lived disease-free), and longevity than the calendar years you have been alive. Longevity clinics, wearable technology companies, and researchers are increasingly focused on the idea that two people born the same year may have dramatically different health outcomes depending on how quickly their bodies are aging internally. Recent research into aging biomarkers, epigenetic testing, and cellular health tracking has fueled growing public interest in the concept. Here’s a look at seven bio-age indicators and what they could tell you about your body’s health.