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Puberty is the time in life when a person becomes sexually mature. It is a physical change that usually happens between ages 10 and 14 for girls. Some African American girls start puberty earlier than white girls, making their age range for puberty 9 to 14. Puberty starts when a part of the brain called the hypothalmus begins releasing a hormone called gonadotropin releasing hormone (GnRH). GnRH then signals the pituitary gland to release two more hormones - luteinizing hormone (LH) and follicle-stimulating hormone (FSH) - to start sexual development.
Sources
National Institute of Child Health and Human Development