Aging is a complex biological process whereby the functional capacity of the body diminishes with time, ultimately leading to the death of the individual. However, aging is also associated with the onset of many diseases, including cancer, which is often called a “disease of aging”. While aging has major effects on the individual, it also represents a significant burden on society as a major healthcare cost. Therefore, it is of chief importance to understand the normal process of aging to help improve not only the lifespan of individuals, but also their healthspan; in other words, to enable people to live longer, healthier lives.