The obligation to support a child in Colorado terminates when the child is 19 [unless the child remains in a secondary education program past age 19] or is emancipated. Often that leads a parent paying support for several children to think they can automatically deduct a portion of their child support once the child turns 19. That is incorrect.
Co long as a child support order continues to exist for younger siblings of a child who turns 19 or is otherwise emancipated, it is necessary to file a motion requesting modification of support.
However, child support does automatically terminate when the criteria are met and the child support order only covers one child. Examples for emancipation include but are not limited to a child who is married prior to age 19 or who is fully self-supporting [a good example of this is a child who entered the armed forces].