In Pa, unless otherwise agreed or ordered, child support ends on the later date of the child's graduation fro high school or attainment of 18 years of age. If you're the parent paying support, you may want to advise Domestic Relations in advance of when the child will be no longer eligible for support. If arrears are still owed after the termination date, they will have to be paid. If you're the parent receiving support, you should receive an inquiry from DRO ahead of time, asking when the support should end. Respond to that inquiry. If you continue to receive support to which you are not entitled, it's safe to assume you'll be expected to pay it back.
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It depends on whether the child has graduated from high school at that point. Child support typically ends when the child turns 18 or graduates from high school, whichever is last. There are some exceptions. If the child has a mental or physical disability that prevents them from being self-supporting, support may continue. Also, some children who are cyber schooled do not complete their classes at the same time as the schools do and support may continue for a bit longer. You should speak with an attorney.
My response is based solely on the limited information contained in the question. It is not meant to substitute your attorney's advice.