Age can be a factor, stress, weight gain or loss...there are any number of things that can make a woman's cycle irregular.
If she's irregular to the point where she is worried about it, hormonal birth control will bring things into line and give her a 28-day cycle to work with. But that's a big step to take just for an irregular cycle.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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