HDL cholesterol, also known as “good” cholesterol, is a biomarker commonly used in assessing longevity. High levels of HDL cholesterol are associated with a reduced risk of heart disease and are considered beneficial in promoting overall cardiovascular health. This biomarker indicates the ability of the body to effectively transport excess cholesterol from the bloodstream to the liver for removal, thereby reducing the risk of plaque buildup in the arteries. Research has consistently demonstrated a correlation between high HDL levels and increased longevity, making it an important marker to monitor for individuals seeking to maintain optimal health and longevity.