If it is malleable you want, why not have even younger children, like around six to ten in terms of age? They are much more malleable than teenagers who can have the 'I'm MY OWN PERSON MAAAN.... YOU CAN'T UNDERSTAND ME MOM/DAD." vibe. 

Younger kids brains are developing and what not and are more inclined to taking in the knowledge instead of being at a state of wanting to reject it and such.