As I understand the law, and I could be wrong about this he is facing criminal charges so there is no "settling out of court".  He has been charged with a crime rather than being sued.  I assume the allegation that she told him she was under age and the fact that he told her "he could go to jail for this" is documented evidence, otherwise it wouldn't be in the arrest report.

The evidence (as reported) isn't good for him and my thinking is that his only hope is to plea down to a lesser charge.  Either way I think he's going to serve some time.

---