Teens in America are in touch with their peers on average 65 hours a week, compared to about four hours a week in preindustrial cultures.
Here is more. The problem, of course, is that a contemporary wise and moderate 33 year old is looking to climb the career ladder, find a mate, or raise his babies. He doesn’t have a great desire to educate unruly fifteen year olds and indeed he can insulate himself from them almost completely. He doesn’t need a teenager to carry his net on the elephant hunt. Efficient capitalist production and rising wage rates lead to an increased sorting by age and the moral education of teens takes a hit.