If you grow armpit hair does that mean hit puberty yet?

Growing underarm hair is a common sign of puberty, but it does not necessarily mean that you have hit puberty yet. Puberty is a gradual process that usually starts between ages 8 and 13 in girls, and between ages 9 and 15 in boys. Other signs of puberty include breast development and menstruation in girls, and voice deepening and facial hair growth in boys. If you are concerned about whether or not you have hit puberty, you should talk to your doctor or a trusted adult.