In Colorado, sex offenses against children carry no statute of limitations. However, whether a prosecutor will consider the case provable after all of this time is a separate question. I suggest you make an appointment with an attorney in the juvenile sex crimes unit of your county District Attorney and discuss the state of the evidence that may yet be available.
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Felony sex crimes against children have no limitation period. However, the District Attorney will have to determine if they believe they can prove the guilt of the offender beyond a reasonable doubt. Rape cases have been proven after many years, but it gets harder the more time passes.
You can and should report the crimes to the police and the District Attorney. Then it will be up to them to determine if they can gather enough evidence for a conviction.
You can reach Harkess & Salter LLC at (303) 531-5380 or info@Harkess-Salter.com. Stephen Harkess is an attorney licensed in the state and federal courts of Colorado. This answer is for general information only and does not create an attorney client relationship between Stephen Harkess or Harkess & Salter LLC and any person. You should schedule a consultation with an attorney to discuss the specifics of your legal issues.