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.
1 The average age of menarche is 13 years, but it can be as early as 8 years and as late as 18 years and still be normal. 2  Premature or delayed menarche should be investigated-ie before 8 years or after 16 years.3  Normal menstruation then occurs in a monthly cycle until menopause, unless interrupted by pregnancy. This may be due to improved nutrition (and subsequent weight) in the population. 2  The average age of menarche is 13 years, but it can be as early as 8 years and as late as 18 years and still be normal.