Aging is a natural process defined by time-dependent physiological changes that reduce functional capacity over time. Maximum lifespan for humans is around 120 years, though average life expectancy continues to increase globally due to improvements in public health, medicine, and lifestyle. At the cellular level, aging is influenced by the shortening of telomeres with each cell division as well as a decline in the activity of telomerase. While aging offers no clear evolutionary advantage, humans strive to find meaning even in old age through relationships, creativity, and spiritual fulfillment. Physicians have a duty to report patients with medical conditions like Alzheimer's that could impair driving ability and increase safety risks.