Starting at about age 40, people tend to lose about four-tenths of an inch of height every decade, said Dr. David B. Reuben, chief of geriatrics at the David Geffen School of Medicine at U.C.L.A. Some of the height loss occurs as part of the normal aging process, and some because of disease. Our old friend gravity, bane of the first vertical height measurement, also plays a role. “It’s a Newton thing,” said Dr. Reuben, a member of the American Geriatrics Society.
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