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At what age does a person start to slow down?

According to the Cleveland Clinic, the gradual loss of muscle mass, a condition known as sarcopenia, can begin around age 30 and progress at a rate of 3–5% per decade for inactive people. This biological fact serves as a stark starting point for answering the question: At what age does a person start to slow down? The answer is more complex than a single age, as different physical and cognitive abilities decline at varying rates throughout adulthood.