Describe the age range at which the majority of American girls experience menarche. Explain the "secular trend" and theoretical causes for the trend
What will be an ideal response?
Most girls experience menarche between the ages of 11 and 14. However, some girls may be as young as 7 or as old as 26. The "secular trend" is the trend for menarche and other physical changes associated with puberty to be experienced earlier with each new generation. For example, a girl in 1930 was most likely to experience menarche at age 13.2. A girl in 1990 was most likely to experience menarche at age 12.5. There are several theories about the cause of the secular trend: better nutrition and medical care, or more toxins in the environment that act like hormones to stimulate changes.
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