E-9 10 is the new 15 as kids grow up faster

10 is the new 15 as kids grow up faster Zach Plante is close with his parents — he plays baseball with them and, on weekends, helps with work in the small vineyard they keep at their northern California home. Lately, though, his parents have begun to notice subtle changes in their son. Among other things, he's announced that he wants to grow his hair longer — and sometimes greets his father with "Yo, Dad!"

In some ways, it's simply part of a kid's natural journey toward independence. But child development experts say that physical and behavioral changes that would have been typical of teenagers decades ago are now common among "tweens" — kids ages 8 to 12.

Some of them are going on "dates" and talking on their own cell phones. They listen to sexually charged pop music, play mature-rated video games and spend time gossiping on MySpace. And more girls are wearing makeup and clothing that some consider beyond their years.

Zach is starting to notice it in his friends, too, especially the way they treat their parents.

"A lot of kids can sometimes be annoyed by their parents," he says. "If I'm playing with them at one of their houses, then they kind of ignore their parents. If their parents do them a favor, they might just say, 'OK,' but not notice that much."