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In the early stages of menstruation which begins around 11-14 years, the hormones from the pituitary gland fluctuate and so do the responses of the hormones secreted by the ovary. In young girls this fluctuation is manifested by delayed or too frequent periods. By 16-17 years of age, the menstrual cycle should have stabilized. However, if your irregularity persists beyond 16 years of age, it would be wise to consult a gynaecologist. Also, the menstrual cycle varies in different women. Some have a 30-day cycle, others have a 27 or 28 days and still others may have at the interval of every 35 days. It is the consistency of the cycle that determines regularity and not the number of days between periods. In actuality, a large number of women never achieve a regular cycle. Even those who do, may suddenly become irregular for a time due to shock, overwork or emotional stress.