Since the 1880s in the U.S., the age at which girls typically begin menarche has changed from a younger age in the 1880s to an older age now.

Name: Since the 1880s in the U.S., the age at which girls typically begin menarche has changed from a younger age in the 1880s to an older age now.
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The age at which girls typically begin menarche has decreased since the 1880s, moving from an older age in the 1880s to a younger age now, largely due to improvements in nutrition and health.