Cardiovascular fitness is crucial for longevity as it enhances heart health, improves circulation, and supports overall metabolic function. Regular aerobic activity can lower the risk of chronic diseases like heart disease, diabetes, and certain cancers. It also improves respiratory function and helps maintain a healthy weight, which are significant factors in promoting lifespan. Moreover, better cardiovascular health is linked to improved mental wellbeing and reduced anxiety, contributing to a higher quality of life and longevity overall.