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.
But it turns out that the specifics of your menarche may say more than you realize. First period age is influenced by a huge amount of factors, including up to 100 genes in your body. The average age of first period in the Western world has been getting lower, from an average of 17 over a century ago to around 13 today. That may be partially due to better nutrition, which means that we weigh more at a younger age, and thus our bodies can cope with childbearing earlier.