Biological age refers to the age of an individual based on various biological markers rather than their chronological age, which is simply the number of years since birth. It takes into account factors such as genetics, lifestyle, and overall health, providing a more accurate reflection of how well a person's body is functioning compared to others of the same chronological age. To assess biological age, scientists may evaluate indicators like DNA methylation, telomere length, and metabolic health. These markers can reveal how environmental factors, such as diet and exercise, influence aging. Understanding biological age can help individuals make informed choices to improve their health and longevity.