“How old do you have to be to be a teenager?”
University City Public Library
St, Louis, MO
The concept of “the teenager” developed in the United States during the 1940s. Since the 1600s, it had been common to refer to youths as being in their “teens,” but it was only during the mid-20th century that the term teenager entered the popular vocabulary, according to Encyclopedia of Children, Adolescents, and the Media (SAGE), one of the titles available in Gale Virtual Reference Library.