The declining age of menarche is a classic example of the secular trend in puberty.

Name: The declining age of menarche is a classic example of the secular trend in puberty.
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The declining age of menarche (first menstrual period) is considered a classic example of the secular trend in puberty, where there has been a decrease in the age of onset of puberty over the past century due to improved nutrition, healthcare, and other environmental and societal factors.

The Declining Age of Menarche Is a Classic Example of the Secular