My child just turn 18. Under the Massachusetts law. I'm not sure how the law works and I'm very skeptical about paying child support when they turn 18. I heard I have to pay til they turn 23 if continues going to college after High School. I'm really confused by the law saying if they are 18 or older living with her mother. I'm still obligated to pay child support. Now, other words I heard if she's not living home and stay at a dorm in college I don't have to pay child support. So I'm not sure if i understands. Can someone please help me. That would be very helpful.