There comes a time in every parent's life, when the child that you have nurtured through all the difficulties that life throws at them, decides to strike out on their own. With luck, you will have taught your child all he or she needs to know to survive in this world.
Some children leave earlier than others.
I moved out shortly after I turned eighteen. Venus was twenty-two, and only moved out when we were married. Other children don't move out at all. And some even move back in after a brief testing of the waters. Both Frances and Christopher have done such as this.