How old do you have to be to legally move out of your parents' house in Colorado?

there are some 17 graduates out of school that have jobs and live on their own. i haven't heard of a cop hunting someone down that has a full time job and finished with high school. some over protective, controlling parents might put up a fuss but nothing would really come of it . the teenager is working, has transportation, roomates. parents don't have a chance on getting that teenager back home.