The average age of menarche,a girl's first menstruation,in the United States is approximately ________ old.
A) 10 years
B) 12 ½ years
C) 15 ½ years
D) 18 years

Question

Quizplus · Accepted Answer

The average age of menarche in the United States is approximately 12 ½ years. This can vary depending on a number of factors such as nutrition, genetics, and overall health, but 12 ½ years is the most commonly reported age.

The Average Age of Menarche,a Girl's First Menstruation,in the United