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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 31 days in adults (an average of 28 days).Menstruation stops occurring after menopause which usually occurs between 45 and 55 years of age.Bleeding usually lasts around 2 to 7 days.he 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 31 days in adults (an average of 28 days).
1 Work out the length of your average menstrual cycle. 2  Day one is the first day of the menstrual period and the last day is the day before the next period begins. 3  Ovulation happens about two weeks before the next expected period.4  So if your average menstrual cycle is 28 days, you ovulate around day 14.racking your ovulation. 1  Work out the length of your average menstrual cycle. 2  Day one is the first day of the menstrual period and the last day is the day before the next period begins.