Pennsylvania law establishes that both parents are liable for the support of their children who are unemancipated and 18 years of age or younger. However, parents may be liable for the support of their children who are 18 years of age or older. For example, a support obligation may continue for a child who is 18 and still attending high school. When a child is emancipated, or over 18 years of age and no longer attending high school, one of the parents may file a "Petition for Modification of an Existing Support Order" to request that the child support order be stopped.
See Question and Answer #3 for more information. Additionally, there may be other situations, such as the existence of physical or emotional challenges, when parents may be required to pay support for a child who is 18 years of age or older.