1963: The Year of the Revolution by Robin Morgan and Ariel Leve
In the course of human history, teenagers are a fairly recent invention. Of course, humanity’s always gone through adolescence, but as a social construct, young adulthood was really developed after World War II, when post-war prosperity meant that teenagers had money—and, therefore, agency—for the first time en masse. Add to that the baby boom, and you’ve got yourself prime conditions for changing the culture.
The Literary Omnivore 