Ohio Rev. Code § 3119.861: Support orders after a child's nineteenth birthday.

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) or (2) of section 3119.86 of the Revised Code 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.