Then there’s the whole question of whether modern parents are more watchful and nervous about safety than previous generations. Yes, some are. Part of the problem is that with wall to wall Internet and cable news, every missing child case gets so much airtime that it’s not surprising even normal parental anxiety can be amplified. And many middle-class parents have gotten used to managing their children’s time and shuttling them to various enriching activities, so the idea of letting them out on their own can seem like a risk. Back in 1972, when many of today’s parents were kids, 87 percent of children who lived within a mile of school walked or biked every day. But today, the Centers for Disease Control report that only 13 percent of children bike, walk or otherwise t themselves to school.

　　The extra supervision is both a city and a suburb phenomenon. Parents are worried about crime, and they are worried about kids getting caught in traffic in a city that’s not used to pedestrians. On the other hand, there are still plenty of kids whose parents give them a lot of independence, by choice or by necessity. The After School Alliance finds that more than 14 million kids aged 5 to 17 are responsible for taking care of themselves after school. Only 6.5 million kids participate in organized programs. “Many children who have working parents have to take the subway or bus to get to school. Many do this by themselves because they have no other way to get to the schools,” says Dr. Richard Gallagher, director of the Parenting Institute at the New York University Child Study Center.

　　For those parents who wonder how and when they should start allowing their kids more freedom, there’s no clear-cut answer. Child experts discourage a one-size-fits-all approach to parenting. What’s right for Skenazy’s nine-year-old could be inappropriate for another one. It all depends on developmental issue, maturity, and the psychological and emotional makeup of that child. Several factors must be taken into account, says Gallagher. “The ability to follow parent guidelines, the child’s level of comfort in handling such situations, and a child’s general judgment should be weighed.”