I'd be quite shocked if your state had no statute of limitations on misdemeanor petty theft (it **was** a petty amount under the then-statutory limit, wasn't it?). Easiest question in the world to answer, either by your attorney, a PD, or a little work on Lexis or WestLaw.
There is no statute of limitations on probation violations in most states. A judge can throw you in jail for a violation when you were 18 when you are 95 years old. Go figure.