Criminally, Pennsylvania has a two year statute of limitations for minor offenses and five year statute of limitations for major offenses. The period begins to run upon commission of the offense.
Civilly, an action relating to damages in actions for identity theft must be commenced within four years of the date of the offense or four years from the date of the discovery of the identity theft by the victim.
The following statutes relate to your claim: 42 Pa.C.S.A. § 5525, 42 Pa.C.S.A. § 8315.
Furthermore, an admission, if property substantiated by evidence, can always be used against an opposing party to prove guilt or culpability.