Any girl age 10-12 . (Double digits but not a teen) Tweens are also know known as pre-teens.
Mom of tween: to dad," uggh I can't believe how our tween is acting!"
Tween daughter:to parents"OMG! I can't believe that u guys are talking about me like that! Ouuuu is that a shoe sale! Oh look! A new trend set my Beyoncé !"