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PRE-menopause (also known as PERImenopause) symptoms can start in the 30's, but that doesn't necessarily mean real menopause is right around the corner, still may not hit that until 50's. Another good read, especially if you're thinking about taking anything hormonal (including contraceptives) is Natural Hormone Balance for Women by Uzzi Reiss. It covers all the hormones and all the ages, symptoms, treatments, etc.
