You may always report a crime and I encourage you to do so. Whether or not it is legally pursuable depends on the statute of limitations which includes many factors not listed. When an offender moves out of state, the statute is tolled, etc. If you say that this happened, your testimony IS the evidence. Many CSC offenders have been convicted on the victim's testimony alone. In addition, even if your case cannot be prosecuted, if this man is a suspect in other assaults, your information/testimony may be helpful to other prosecutions. The only answer that matters will come from the prosecutor's office and not from the lawyer's on this site.