He is supposed to pay until all of the arrears are paid off, no matter how long it takes. He is also obligated to pay these expenses to you either personally, or through the DA's office if it has ever gone through the DA's office at all.

If your eex owes back erarages he will have to continue to pay child support until those errarages are paid in full. He will have to pay child support as long as the child is still in high school. The child support services will send out a letter stating that the child support will continue however they may not ake out the amount of the current order but a part of it. You may need to contact the child support agency and talk to them they can tell you how much he will have to continue to pay after the child reaches 18 or graduates high school. also if the father is not paying his current child support or only part of it you can have his wages garnished. You will get alot more done if you have a lawyer, this way the father could be proscuted by the DA if your state allows jail time for non-child support.Your lawyer will be able to tell you your state laws.