iGen: Why Today's Super-Connected Kids Are Growing Up Less Rebellious, More Tolerant, Less Happy--and Completely Unprepared for Adulthood--and What That Means for the Rest of Us

by Jean M. Twenge

The low teen birthrate is also an interesting contrast to the post–World War II era—in 1960, for example, 9% of teen girls had babies. Back then, though, most of them were married; the median age at first marriage for women in 1960 was 20.