Adolescence

Adolescence (from Latin: adolescere meaning "to grow up")^[1] is a transitional stage of physical and mental human developmentgenerally occurring between puberty and legal adulthood (age of majority),^[1][2] but largely characterized as beginning and ending with the teenage stage.^[2][3][4] According to Erik Erikson's stages of human development, for example, a young adult is generally a person between the ages of 20 and 40, whereas an adolescent is a person between the ages of 13 and 19.^[3][4] Scholars have found it incredibly difficult to agree upon a precise definition of adolescence, because it can be approached from so many angles


http://en.wikipedia.org/wiki/Adolescence