Childhood has lengthened, with teens treated more like children, less independent and more protected by parents than they once were. The entire developmental trajectory, from childhood to adolescence to adulthood, has slowed. Adolescence—the time when teens begin to do things adults do—now happens later. Thirteen-year-olds—and even 18-year-olds—are less likely to act like adults and spend their time like adults. They are more likely, instead, to act like children—not by being immature, necessarily, but by postponing the usual activities of adults. Adolescence is now an extension of childhood
  
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