Why not? :) All these things are really simple in their essence. They're abstract but an average 14 year old in modern civilisation already has the cognitive machinery necessary to grasp such abstractions. In fact, I think at that age, when they discover abstraction and formal reasoning and what they can do with it (there's a reason teenagers are so full of all kinds of ideas, they're starting to explore the world in full generality), it would be extremely stimulating food for their minds.
you mean the ideas of a dual space of a linear space and of tangent bundle to a manifold? :)