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  Female hormones estrogen and progesterone control             
  when puberty will begin in girls. This usually happens
  between the ages of 8 and 15.

  The hormone testosterone controls when puberty
begin in boys. This generally happens between
  the ages of 10 and 14 years old.


During puberty a child physically develops into an adult. Click below for information:

All About Puberty               Girls to Young Women
Boys to Young Men   Puberty Facts (Medicine Net)