the process of aging is not as ruinous for muscles as bed rest or spaceflight, but muscular atrophy—the gruesome technical term is “sarcopenia,” Greek for “loss of flesh”—is a major cause of disability and disease among the elderly. As we age, muscle fibers typically dwindle in size and number, and nerves degenerate.50 The result is a loss of strength and power. On average, grip strength in industrialized countries like the United States and the U.K. declines about 25 percent from the age of twenty-five to seventy-five.
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