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in 2005 down to age 12.3 in 2014) and a similar trend in time, but also similar findings about ethnic, cultural, and environmental effects. The average age of menarche was about 12.7 years in Canada in 2001, and 12.9 in the United Kingdom. A study of girls in Istanbul, Turkey, in 2011 found the median age at menarche to be 12.7 years. In the United States, an analysis of 10,590 women aged 15-44 taken from the 2013-2017 round of the CDC's National Survey of Family Growthfound a median age of 11.9 years (down from 12.1 in 1995), with a mean of

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