A person may legally move out of his legal guardian's house when he reaches the age of majority, which is 18 years old in Missouri. In certain cases, a minor may become legally emancipated from his legal guardian beginning at age 16.
Legal emancipation of a minor occurs automatically if a minor enlists in the military or gets married. Alternatively, a minor's legal guardian can sign away his parental rights. In order to be considered for emancipation, a minor must be able to show a court that he is living on his own and is financially supporting himself through legal means.