Technically, DHS can separate any child from parent because there's no minimum age limit

There is no official cut-off age on the books to prevent U.S. Customs and Border Protection officers from separating a young child or baby from his or her parent after a family unit is apprehended illegally entering the U.S. between a port of entry, according to a Department of Homeland Security spokesperson.

“It’s up to the sectors because once everyone shows [and claims to be below] that age, everyone shows up under that age,” the DHS spokesperson told the Washington Examiner.