I knew that. Just being a smart ass.
I cannot provide any advice but since you only asked for opinions...
I would not attend the reunion. No way. He should be prepared for some sort of a litigation...civil action rather than criminal given the circumstances. This may wind up being no more than an attempt to besmirch his name in court papers since no criminal action is possible at this late date. But anyone can file suit against anyone. This is a tactic unto itself and if he is not certain of this woman's resources, she may have the wherewithall to file a suit to simply make his life hell. Forwarned is fore-armed.
“since no criminal action is possible at this late date”
I’ll say again,, it could be possible, depends on the state and the circumstances. It’s unlikely, but by no means impossible. More than a few people have been prosecuted LONG after the fact, repressed memories, etc.