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en.wikipedia.org/wiki/Menarche

Menarche is the first menstrual cycle, or first menstrual bleeding, in female humans. From both social and medical perspectives, it is often considered the central event of female puberty, as it signals the possibility of fertility. Girls experience menarche at different ages.

kidshealth.org/en/kids/menstruation.html

A girl's first period, called menarche (say: MEH-nar-kee), signals that she is growing up and her body is preparing so that she might have a baby someday.

www.obgyn.net/sexual-health/first-menstruation-average-age-and-physical-signs

Nov 18, 2011 ... While girls vary in the ages that they are when they start their periods and when the other signs of puberty occur, the order is fairly consistent.

www.nytimes.com/2012/04/01/magazine/puberty-before-age-10-a-new-normal.html

Mar 30, 2012 ... “You know, I was one of those flat-chested girls at age 14, reading, 'Are You There God? It's Me, Margaret,' just praying to get my period.

teens.webmd.com/features/girls-first-period

Although a girl's first period usually occurs at about age 12, some girls experience their first period much earlier. And even before she gets her first period, your ...

www.ubykotex.com/en-us/periods/puberty/what-is-the-youngest-age-that-a-girl-can-start-her-period

You know, I'm not sure what the world record is for youngest person to start her period -- but I do know there's a huge range. I know girls who started at age 8 or ...

rubycup.com/all-about-your-period/girls-first-period

We give you the answers to your questions and explain your first period in ... Many girls get their period between ages 12- 14, but it can also start earlier or later.

health.usnews.com/health-news/blogs/health-advice/2009/01/26/is-it-normal-for-girls-to-have-periods-at-age-9

Jan 26, 2009 ... Most girls begin their menstrual cycles just before reaching their ... The average age of menarche (or the beginning of menstruation) in the ...

www.cwhn.ca/en/node/39365

Steingraber reveals that good documentation exists over the last hundred or so years to establish that the average age of first menstruation in young white girls ...