I'm not sure which category this belongs to, so I guess I'll post it here.
The situation is thus:
A person with an O-1 visa legally entered the United States with their dependent, unmarried child of an age under 21. At this point, the child qualifies for an O-3 visa. However, the O-3 visa is not applied for, for such a time that the child is now over 21 years of age, and, as I understand it, no longer qualifies.
My question is this:
Does the now-adult child qualify for any other type of legal status that allows them to reside and study in the United States?
In addition, if they do not qualify for any, is this considered an overstay, and if so, when would the overstay period have started?

