About Tweens 

The tween years, from around the ages of 10-14, are a developmental period marked by expectations of increasing responsibility and self-reliance. At this age, schoolwork becomes more complex. Staying organized becomes more challenging. Friendships and social relationships become more important. This is an exciting age. Tweens are no longer the little kids they once were—they're beginning to stretch into adolescence and greater maturity.  They're growing up!