In the United States since the mid-1800s, the average age of menarche has:
A) increased for boys but decreased for girls.
B) stayed remarkably stable at about 11.5 years.
C) increased from about age 10 to age 14.
D) decreased from about 17 years old to 13 years old.

Question

Quizplus · Accepted Answer

The average age of menarche in the United States has decreased from about 17 years old in the mid-1800s to around 12-13 years old in recent times, due to factors like improved nutrition and health.

In the United States Since the Mid-1800s, the Average Age