To be jailbait in the first place she'd have to be underage. That's... what that word means. In fact if we want to be really precise, in some circumstances it's used to describe girls who are developed enough to appear "old enough".
Another reason bust size is a terrible way to judge someone's age.
But it's even worse when you realize some real people can look that young well into their thirties. Too bad everyone is grossed out by adults who look that much younger than they actually are.
No wait. I'm not.
And it has absolutely no impact on my ability to understand and respect the concept of consent. Which is good. Since, you know, even adults can be incapable of it.