Puberty Facts



  • Puberty is the time of life when girls and boys mature sexually.
  • The age of puberty varies hugely, but on average it is between 10 and 13 years for girls, and between 11 and 15 years for boys.
  • Puberty is started by two hormones sent out by the pituitary gland – the follicle-stimulating hormone and the luteinizing hormone.
  • During puberty, a girl will develop breasts and grow hair under her arms and around her genitals.
  • Inside her body, a girl’s ovaries grow ten times as big and release sex hormones.
  • The sex hormones estrogen and progesterone spur the development of a girl’s puberty.
  • Puberty is part of the longer and more complex time called adolescence, when young people %tart to change, not only physically, but in the way they think and behave as well.
  • A year or so after puberty begins, a girl has her menarche (the first menstrual period). When her periods come regularly, she will be able to have a baby.
  • For a boy during puberty, his testes grow and hair sprouts on his face, under his arms and around his genitals
  • Inside his body, a boy’s testes begin to make sperm.