Listen, it's fanFICTION!!! It's meant to be like that!!! :) Seriously, anyone who's telling you to change the ages or anything, please stop. If she was 16, it wouldn't make as good a story as it is now. I've just read this up till now and I have to say, the fact that she's only 14 would make the whole thing a lot better than if she was old enough!!!
I hope you carry on and leave everything as it is, it rocks!!!