In North Carolina, child support is paid until the child turns 18 years old. If the child is still in high school when they turn 18, it could be paid until age 20, but it would stop once they graduate high school. If you are paying child support for multiple children, you will still need to pay for the other children, but payments will stop as each child graduates or turns 20, whichever occurs first. If you or your ex have a significant change in financial circumstances before your shared children turn 18, you may be able to request a modification to the child support order.