Menarche is the first menstrual cycle, or first menstrual bleeding …
From both social and medical perspectives, it is often considered the central event of female puberty …
Girls experience menarche at different ages. …
The average age of menarche is about 12.5 years in the United States, 12.72 in Canada, 12.9 in the UK …
Click PLAY or watch it on YouTube.
related – BBC – Beth Tweddle on the problems of puberty for young sportswomen
(via Gymnastics News Network)
Gymnastics Coaching.com 