The death of renowned biomedical researcher Leonard Hayflick sparks conversations about his game-changing discovery that cells have an inbuilt clock and are capable of dividing only a certain number of times, thus determining the maximum lifespan of humans and other organisms. This discovery revolutionized the understanding of aging, challenging the previous belief that it is merely a result of external factors. While some scientists argue that this limit is a cause of aging, others see it as a symptom, with the possibility of extending human lifespan through the manipulation of telomeres. However, practical applications of this discovery are still distant.