Menstrual cycle The first period usually begins between twelve and fifteen years of age, a point in time known as menarche. They may occasionally start as early as eight, and this onset may still be normal. The average age of the first period is generally later in the developing world and earlier in developed world. The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women and 21 to 35 days in adults (an average of 28 days). Menstruation stops occurring after menopause which usually occurs
Menstrual leave employ such woman on days of the menstrual period." While Japanese law requires that a woman going through especially difficult menstruation be allowed to take leave, it does not require companies to provide paid leave or extra pay for women who choose to work during menstruation. In South Korea, not only are female employees entitled to menstrual leave according to the Article 71 of the Labour Standards Law, but they are also ensured additional pay if they do not take the menstrual leave that they are entitled to. In Taiwan, the Act of Gender Equality in Employment gives women three