One account I read had the border guard having to get the horny teens to put their clothes back on and separate them, I forget the source which I usually try to cite.
There are some very young children to be sure but most are older and 14-17, teens.
2/3rds are males over 14; many are really in their 20s or 30s and pose as teenagers
The ticket for welfare for life in gringoland.