It’s not exactly like sems. Sem starts in September, and applications are taken the previous November/December, with decisions being made (if the girls get in) in February/March.
So I assume you have a boy about 20, 20+. Does he need supervision, all the meals taken care of, etc.? If so, does this yeshiva deliver? It’s interesting that Rabbi Green of Monsey, shlit”a, a few weeks ago in Hamodia said that boys don’t necessarily have to learn in E”Y. (And kal vachomer for this girls, but this isn’t going to become a sem bashing thread, right? Let’s stay on topic.) As it happens, though, many do, and if this is the zman his chevra is going (and I’m totally mispael that you can do this so last minute, but kol hakavod. I guess I’ll see when my boys get old enough.) and you see that he would end up there eventually, then maybe he should go now.
Do you have relatives in E”Y, or good friends, someone to be an informal big brother? Do you have some shaichus to the staff of the yeshiva? Because if not, do develop it and keep in touch on a regular basis. Yeah, he’s old enough to be on his own, and there may be a fair chance his next stop will be Lakewood so he’s almost old enough to get married, but we as parents still need to hover ever so gently.
Hatzlacha and kesiva v’chasima tova.