If you do not get help or get frustrated, then give us a call. You can ask for a modification of your current support order every three years or if there has been a significant change in income by either you or the non-custodial parent. Custodial parents should keep in mind that visitation and child support are two separate issues and should be treated as such. If you withhold visitation, you could find yourself in contempt of court, just like the absent parent who fails to pay. It's never too late to collect.
Many states have no statue of limitations on collecting back child support.