I would imagine that even a school aged child could easily disappear, with the same excuses..."She's living with her father now, he'll be calling for the school info," or "We'll be moving in with my folks, and when we get settled, I'll call for the records," or "My husband got a job out of state, can you just give me the info so I have it for the school." And then once they hit junior high or high school age, they would be considered runaways.