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In the 19th century girls typically matured at about 18. Better nutrition in the 20th c. brought the average age, in the US (and probably in other Western, developed countries as well) down to about 12 1/2 years. Obviously diet played a great part in the earlier onset. However, there were always exceptions. I know someone, now in her early 60s, who told me she started menstruating at 9. Interestingly, she had spent her early childhoood in war-torn France, so had poor nutrition for about the first 6 years of her life.<P>There are numerous theories for the earlier onset: exposure to hormones in the food we eat, earlier exposure to sexual material - and I don't mean XXX-rated stuff - I mean the stuff that's around us every day, pressure from society for a child to be interested in the opposite sex at an earlier age, as well as dietary changes.<P>As far as cancers go, current theory is that the longer a woman is exposed to estrogen, the higher her risk of breast cancer. (This is why there was/is so much controversy over women taking hormone replacements after menopause.) Length of exposure is calculated based on when the girl started menarche to menopause - with time off for pregnancies. On the other hand estrogen can be protective against other problems - such as heart disease. Obviously genetics plays a role in these risks, and hopefully a woman's MD will get a good history in order to decide what treatments/options to recommend. Younger women should ask their mothers (and grandmothers) at what age menarche began and at what age they became menopausal.<P>Early puberty can be very stressful for girls - especially those who are interested in a career in dance, skating, gymnastics and other sports where puberty, and the physical changes that go with it, are all-too-frequently feared. <P>The physical changes can lead to significant body-image problems. I went to school with someone who was wearing a bra in the 4th grade. She was also very tall (at least 5'4" then - although she wound up only being about 5'10"). She had to have a letter from the principal of the school so that she would be admitted to children's events. Another friend, a ballet dancer, started to "mature" at the age of 10. By the time she was 16 she had, to ordinary eyes, the most beautiful body - but not in the ballet world, certainly not at the RBS, where she was a student. However, for those of you out there bemoaning a similar fate, she grew up, lost her "baby fat", and became very slim with "normal" (for a dancer) boobs. (Not, I hasten to add, through anorexia.)<P>Karen (P.T.)
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