Grandma and grandpa rarely win a weightlifting contest with their grandchildren. As people get old, they begin losing significant amounts of muscle mass, a deterioration scientists call sarcopenia (SN: 8/10/96, p. 90: http://new.sciencenews.org/sn_arch/8_10_96/bob1.htm). Even the muscle that remains in the elderly isn’t usually as strong as it once was.
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