The Centers for Disease Control and Prevention (CDC) is recognized as the lead United Statesagency[?] for protecting the health and safety of people by providing credible information to enhance health decisions, and promoting health through strong partnerships. CDC serves as a national focus for developing and applying disease prevention and control (especially infectious diseases), environmental health[?], and health promotion[?] and education[?] activities designed to improve the health of the people of the United States.
... 18 to 24, 26.8% from 25 to 44, 27.7% from 45 to 64, and 19.9% who are 65 years of age or older. The median age is 43 years. For every 100 females there are 102.7 males. ...