The menarche is one of the later stages of puberty in girls. The first period is called menarche . The average age of menarche in humans in 12years, but is normal anywhere between ages 8-16. A number of physical and psychological changes take place at puberty:- The uterus , the uterine tubes and the ovaries reach maturity. The menstrual cycle and ovulation begin {menarche},The breast develop and enlarge,Pubic and auxiliary hair begins to grow, Increases in height and widening of the pelvis. Increased fat deposited in the subcutaneous tissue especially at the hips and breasts. The cessation of menstrual cycles at the end of a woman's reproductive life is termed menopause. The average age of menopause in women is 51 years, with anywhere between 40-58 being common. Menstruation is the periodic discharge of blood and sloughed endometrium (collectively called menses or menstrual flow) through the vagina. The menstrual cycle is the regular natural change that occur in the female reproductive system (specially the ovaries and uterus) that makes pregnancy possible. This cycle is controlled by hormones, The menstrual cycle occurs because of a complex relationship between hormones from the brain and ovaries. This leads to the development and release of an egg from the ovary (ovulation) and growth of the internal lining (endometrium) of the uterus, to prepare it for pregnancy Menarche is the first menstrual cycle, or first menstrual bleeding, in female human beings. The average age of menarche is 11.75 years. Menopause is the permanent cessation of menses. Menopause typically (but not always) occurs in women during their late 40s or early 50s, and signals the end of the fertile phase of a woman's life.