Nearly everyone shrinks with age. But some people insist, often after an annual visit to their doctor, that they’ve added a half-inch or so. If they aren’t children or teens, they’re probably mistaken, says Todd Milbrandt, a pediatric orthopedic surgeon at the Mayo Clinic in Rochester, Minn., who explains the significance of physes and what makes 20 a special number.She spurts, she growsAll children grow at a slow rate until they stop, with spurts as infants and during adolescence. With a good diet rich in vitamin D and calcium, most girls will grow from age 10 to 14 and be completely done by 16, while boys grow from 12 until about 16 or 18, “with some, in rare circumstances, growing up until 20,” says Dr. Milbrandt, a board member of the Pediatric Orthopaedic Society of North America. After that, their growth plates, also called physes—the cartilage near the ends of each bone—are absorbed into the body, which forestalls further change.
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