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.
(NHANES) data collected from 1999 â2004, they have an-. alyzed self-reported age of ï¬rst menses, determining the. mean age of menarche for women now older than 80 years. of age to women about 20 years of age, grouped into.