There is generally no obligation to pay child support (or college expenses) for a child after they have emancipated. In Texas, the age of emancipation is 18, or as soon as they are done with high school (if the child is 18 but still in school). An obligation to continue support after that age can be created by agreement, but that will be clearly spelled out in your divorce decree (and it sounds like there's no such obligation implied in yours). It might be worth it to have an attorney review your Decree if you are still concerned - it shouldn't take longer than an hour (and probably less). Better safe than sorry when it comes to court orders!