The executive branch is composed of the President, Vice President and Cabinet members. President The president is the head of state, head of the U.S. government and the commander-in-chief of the U.S. military.
Menarche. The average age of menarche, or first menstruation, in the United States is 12.88 years for Caucasian girls and 12.16 years for African American girls. A popular misconception is that menarche marks the beginning of puberty; in reality, menarche occurs later in puberty.
Menarche is the start of the first menstrual period. Menarche has occurred at a younger age during the last century. This may be due to improved nutrition (and subsequent weight) in the population. The average age of menarche is 13 years but it can be as early as 8 years and as late as 16 years and still be normal.