pre-teen 
adjective
Relating to a child of about eleven or twelve years of age: the perfect pre-teen bedroom...
- There is nothing new in the issue of under age drinking but pre-teen drinking is a new phenomenon which is very worrying.
- So, we pressed play and fell into this glorious pre-teen memory of a perfect 80s democratic, utopian indie rock underground.
- There's the protective dad seated next to his still-innocent, pre-teen daughter.
noun
A pre-teen child: the latest craze to hit British pre-teens...
- The key is to make the party interesting for everyone there; crying babies, restless toddlers, rambunctious grade school kids and sarcastic pre-teens.
- With this truancy law at their disposal, teens and pre-teens are on the verge of absolute power.
- The general courses are for all the public: kids, pre-teens, teens and adults.