In the state of South Carolina, 17 years old is the legal age one can move out of their home without permission. A lot of people don't know this because it most states it is 18, so that's why there are a lot of wrong answers on this page. This grey area is reaking havic on my life with my 17 year old child because even though they have all these rights, we as parents still have to support them and allow them back into our home if they so wish to move back.