Why Aging May Be a Program, Not a Breakdown

In some ways, we know aging when we see it, from the graying of hair to the wrinkling of skin to declines in motor, sensory, and cognitive capacities. Yet the underlying biology of aging remains a matter of uncertainty and debate. Many lines of research align with the theory that aging is a direct result of decay — the inevitable degradation of molecules (including proteins or DNA), organelles…

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