Can a 14-year-old and an 18-year-old decide where they want to live?

in a divorce i have seen judges letting young ones live with the parent of there choice, but lets say the young one moves out you must report them as a run away. * The 18-year-old is a legal adult and can make their own decisions. The 14-year-old is still a minor and would not be allowed to choose with whom he or she wishes to live. The court bases such decisions upon what is in the best interest of the child and not on the preference of any involved party.