This is a civil case. Even if the case takes place and he loses, he will not go to jail. The worst that would happen is he will have to pay damages. Also, as it is a civil case, extradition is not relevant. That only applies to criminal cases.
She claims they had sex when she was 16 and 17 - he denies having sex with her at all. According to her, the incidents took place in jurisdictions where the age of consent is 16. The talk of underage sex comes about because she is bringing the case in Florida where the age of consent is 18. It appears that she or her lawyers may be hoping to persuade the Florida courts to treat that as the age of consent where the incidents took place regardless of the actual law.
If this ever ends up in court, the central questions are:
- Did the alleged incidents take place. Her allegations should be taken seriously and investigated properly, but that is not the same as automatically believing her.
- Was she trafficked for sex by Epstein.
- If the answer to the previous two questions is yes, was Andrew aware of this or should he have been aware of it.
If the answer to any of these questions is no, Andrew should be in the clear legally (although I'm not an expert on Florida law - he would certainly be in the clear in the UK, but it is possible the courts in Florida would take a different view). If the answer to all three is yes, Andrew should lose if this gets to court ("should" rather than "will" because, as noted above, I am not an expert on Florida law).