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Adolescence has always been troubled, but for reasons that are somewhat mysterious, puberty is now kicking in at an earlier and earlier age. A leading theory points to changes in energy balance as children eat more and move less.

Recent studies in the neuroscientist B.J. Casey's lab at Cornell University suggest that adolescents aren't reckless because they underestimate risks, but because they overestimate rewards—or, rather, find rewards more rewarding than adults do. The reward centers of the adolescent brain are much more active than those of either children or adults. Think about the incomparable intensity of first love, the never-to-be-recaptured glory of the high-school basketball championship. What teenagers want most of all are social rewards, especially the respect of their peers. In a recent study by the developmental psychologist Laurence Steinberg at Temple University, teenagers did a simulated high-risk driving task while they were lying in an fMRI brain-imaging machine. The reward system of their brains lighted up much more when they thought another teenager was watching what they did—and they took more risks.

What happens when children reach puberty earlier and adulthood later? The answer is: a good deal of teenage weirdness. Fortunately, developmental psychologists and neuroscientists are starting to explain the foundations of that weirdness.

Meanwhile, rates of anxiety and depression have also risen in tandem with self-esteem. Why is this? “Narcissists are happy when they’re younger, because they’re the center of the universe,” Twenge explains. “Their parents act like their servants, shuttling them to any activity they choose and catering to their every desire. Parents are constantly telling their children how special and talented they are. This gives them an inflated view of their specialness compared to other human beings. Instead of feeling good about themselves, they feel better than everyone else.” In early adulthood, this becomes a big problem. “People who feel like they’re unusually special end up alienating those around them,” Twenge says. “They don’t know how to work on teams as well or deal with limits. They get into the workplace and expect to be stimulated all the time, because their worlds were so structured with activities. They don’t like being told by a boss that their work might need improvement, and they feel insecure if they don’t get a constant stream of praise. They grew up in a culture where everyone gets a trophy just for participating, which is ludicrous and makes no sense when you apply it to actual sports games or work performance. Who would watch an NBA game with no winners or losers? Should everyone get paid the same amount, or get promoted, when some people have superior performance? They grew up in a bubble, so they get out into the real world and they start to feel lost and helpless. Kids who always have problems solved for them believe that they don’t know how to solve problems. And they’re right—they don’t.”

I asked Wendy Mogel if this gentler approach really creates kids who are less self-involved, less “Me Generation.” No, she said. Just the opposite: parents who protect their kids from accurate feedback teach them that they deserve special treatment. “A principal at an elementary school told me that a parent asked a teacher not to use red pens for corrections,” she said, “because the parent felt it was upsetting to kids when they see so much red on the page. This is the kind of self-absorption we’re seeing, in the name of our children’s self-esteem.”

research shows that much better predictors of life fulfillment and success are perseverance, resiliency, and reality-testing