Why is the ninth month called September?
a pre-teenager, generally aged 10-12; also, a youth aged 10-14; also called tween , tweenie
Britney Spears is attractive to tweenagers.
between youth and teenager
A preteenager, generally aged 10–12; also, a youth who has just become a teenager
[1949+; blend of (be)tween and (teen)ager]