I like "boyish" faces. Brad Pitt, for example, has a boyish face and millions of women find him attractive. I don't mean that a guy has to look like Brad Pitt to be attractive, just to say that not all guys have to look chiseled or mysterious or rugged to turn us on.
I think that its fine if you are older and look a little younger, you're still cute! I'm 15 and some of the boys in my grade look like they're 10 honestly. Not to be 'that girl' but it helps if you're decently tall and just have a baby face. But I think its fine! I know lots of guys that look younger but it will help you in the end :)