Were you one of the cool kids? If not then don’t worry, you’re probably the better off for it. “The fast-track kids didn’t turn out O.K.,” said Joseph P. Allen, a psychology professor at the University of Virginia. He is the lead author of a new study, published this month in the journal Child Development, that followed these risk-taking, socially precocious cool kids for a decade. In high school, their social status often plummeted, the study showed, and they began struggling in many ways.”