In Arizona, the duration of child support is determined by the court order that is issued. Generally, parents are expected to pay and/or receive child support until the child reaches their 18th birthday. However, if the child is still in high school when they turn 18, then a parent can expect to pay and/or receive support until their 19th birthday or until they graduate from high school, whichever comes first. For those in Arizona whose orders cover more than one child, the presumptive termination date of support would be tied to the youngest child’s 18th birthday. As older children age out of the order and reach their respective emancipation dates, parents should consider filing a modification with their local court to officially terminate the remaining support orders accordingly.