Puberty is the process of physical changes by which a child’s body matures into an adult body capable of sexual reproduction to enable fertilisation. It is initiated by hormonal signals from the brain to the gonads; the ovaries in a girl, the testes in a boy. (from wikipedia)

Although there is a wide range of normal ages, girls typically begin the process of puberty at age 10 or 11; boys at age 12 or 13. Girls usually complete puberty by ages 15–17, while boys usually complete puberty by ages 16–18. Any increase in height beyond the post-pubertal age is uncommon.  Girls attain reproductive maturity about 4 years after the first physical changes of puberty appear.  In contrast, boys accelerate more slowly but continue to grow for about 6 years after the first visible pubertal changes. (from wikipedia)

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