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This graph plots the height gain in centimetres per year against age for boys and girls. The initial high rate of growth following birth decelerates to a steadier rate of growth by the age of 1. In girls, the rate of height gain accelerates at around age 9, before reaching ‘peak height velocity’ at age 10. This growth rate decelerates and tails off in the teenage years before growth terminates around age 15. In boys, the growth rate accelerates from age 11 to a peak height velocity around age 13. This growth rate tails off and growth terminates around age 17.

 1 How fast do teenagers grow?