(A) Notwithstanding section 3109.01 of the Revised Code, both of the following apply:

(1) The duty of support to a child imposed pursuant to a court child support order shall continue beyond the child’s eighteenth birthday only under the following circumstances:

(a) The child is mentally or physically disabled and is incapable of supporting or maintaining himself or herself.

(b) The child’s parents have agreed to continue support beyond the child’s eighteenth birthday pursuant to a separation agreement that was incorporated into a decree of divorce or dissolution.

(c) The child continuously attends a recognized and accredited high school on a full-time basis on and after the child’s eighteenth birthday.

(2) The duty of support to a child imposed pursuant to an administrative child support order shall continue beyond the child’s eighteenth birthday only if the child continuously attends a recognized and accredited high school on a full-time basis on and after the child’s eighteenth birthday.

(B) A court child support order shall not remain in effect after the child reaches nineteen years of age unless the order provides that the duty of support continues under circumstances described in division (A)(1)(a) or (b) of this section for any period after the child reaches age nineteen. An administrative child support order shall not remain in effect after the child reaches age nineteen.

(C) If a court incorporates a separation agreement described in division (A)(1)(b) of this section into a decree of divorce or dissolution, the court may not require the duty of support to continue beyond the date the child’s parents have agreed support should terminate.

(D) A parent ordered to pay support under a child support order shall continue to pay support under the order, including during seasonal vacation periods, until the order terminates.