Apolipoprotein B is a key biomarker used in assessing longevity. This protein plays a crucial role in lipid metabolism and is a significant risk factor for cardiovascular diseases, which are closely linked to longevity. Elevated levels of apolipoprotein B are associated with a higher risk of atherosclerosis and heart disease, while lower levels are indicative of better cardiovascular health and potential for longevity. Therefore, monitoring apolipoprotein B levels is essential in predicting and potentially improving an individual’s lifespan. By understanding and managing this biomarker, individuals can take proactive steps towards maintaining their cardiovascular health and promoting longevity.