What makes pre-adulthood something new is its radical reversal of the sexual hierarchy. Among pre-adults, women are the first sex. They graduate from college in greater numbers (among Americans ages 25 to 34, 34% of women now have a bachelor's degree but just 27% of men), and they have higher GPAs. As most professors tell it, they also have more confidence and drive. These strengths carry women through their 20s, when they are more likely than men to be in grad school and making strides in the workplace. In a number of cities, they are even out-earning their brothers and boyfriends.