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.
What age is early menstruation? Menarche, a girlâs first period or menstrual cycle used to normally be after 13 years of age. According to pediatrics American girls menstruate nine months earlier that they did 20 years ago on average around 12 years of age.