marriage and parenthood age back a few years, changing the early and mid- twenties from a time of married relationships to a time of non-committed sexual relationships. Younger adults were no longer leaving home to get married. Marriage became less and less of a standard or "pre-requisite" of adulthood. Because of this, this stage of life was no longer characterized by the responsibilities and organization of marriage, leaving younger adults in qualitatively different relationships than before. The Women's Movement: The Women's movement also contributed to the development of emerging adulthood. Before this movement, their sole purpose was to find a husband and bear children, becoming full-time housewives. Soon after, women began to seek options for careers and education that were uncommon in the 1960s. Because of this, more women spend their emerging adulthood (approximately ages 18–29) years pursuing careers and higher education rather than settling down and starting families. This delay in marriage age developed the emerging adult phase of life because many people at this age were exploring and pursuing different paths than predecessors. The Youth Movement: This movement represented a shift in the cultural attitudes and perceptions of adulthood. Previous to this movement in the 1960s and 1970s, many young people aspired to grow up and become adults who were considered wise, in control, and independent. This movement changed perceptions of adulthood to be less favorable than those of youth. Music and phrases reflected the growing movement to celebrate youth and renounce aging. For example, phrases like "I want to be forever young" and "never trust adults" became increasingly common, and youth began to prevail over wisdom in terms of popularity. Because of this, young adults postponed adulthood and prolonged their youth into their twenties by living independently of conditions and characteristics associated with adulthood. The delay of adulthood and popularization of remaining young brought about by this revolution led to the development of emerging adulthood. Physiological development Biological changes Emerging adulthood and adolescence differ significantly with regard to puberty and hormonal development. While there is considerable overlap between the onset of puberty and the developmental stage referred to as adolescence, there are considerably fewer hormonal and physical changes taking place in individuals between the ages of 18–25. Emerging adults have reached a stage of full hormonal maturity and are fully, physically equipped for sexual reproduction. Emerging adulthood is usually thought of as a time of peak physical