All human beings age. It is part of our biology and limits our lifespan to slightly over 120 years.
Not all animals experience aging during their lives. Some animals' bodies do not gradually degenerate as they get older the way our bodies do.
But for humans, once they reach about age 30, their chance of dying doubles roughly every eight years. So, even if you are fortunate enough to become a centenarian, your chance of dying each year will be high.
This high mortality reflects numerous other health problems, such as loss of muscle mass and general frailty, cognitive decline, loss of vision and hearing and many other degenerative changes that characterize the human aging process.
And the reason humans age so markedly may be due to the fact our ancestors evolved during the time of the dinosaurs.
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