In a girl, the age of puberty comes when she has menstruation. This stage can sometimes be very confusing for girls. Some are very eager when the stage comes and some are afraid and are anxious when this period is going to start.
Girls normally go through the menstruation stage between the ages of 8 and 13; which lead to many changes both physically and emotionally due to the hormones in ones body. The first menstrual period for a girl usually occurs when her breasts begin to develop. The menstruation cycle starts about two or two and half years after the development of them.