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 velocityâ€™ 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.