A girl can start her menstrual cycle from when she is about 9 years old any where through to when she is 16 years old.
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The average menstrual cycle lasts 28 days, from the start of menstruation to the start of the next menstruation. The "bleeding phase" typically lasts 5-7 days.
The typical menstrual cycle is around 28 days in length.But everyone is different and menstrual cycles can vary by a few days from cycle to cycle.
The first day of a womans menstrual cycle is also the first day of menstruation.
There are plenty of places online to find a menstrual cycle calculator. Tampax has a very nice menstrual cycle calculator. It is simple and easy to use.
Menopause starts somewhere between 45-55 years old in most people, this is the start of the winding down of the reproductive cycle so menstrual cycles become irregular. When menstrual cycles stop all together can vary greatly from person to person after menopause.