The adolescent growth spurt lasts about two years and is accompanied by the development of sex organs and the growth of pubic hair, as well as the beginning of menstruation in girls. This growth spurt begins at different times for different children — between ages 8 to 15 in girls and ages 9 to 15 in boys. During this growth spurt, girls grow at a rate of 2½ to 4½ inches per year and boys grow about 3 to 5 inches per year. On average, boys begin puberty about two years later than girls, but their growth spurt lasts longer.
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