Hi Krsiii....your right....Composition is not like being a pianist or a performer...i mean it's very difficult to start studying composition lets say at 14-15 years old...even Stravinsky started around 20...(anyway he did quite well eheh!)
If he really wants to get in a school now i think there are several schools (liberal arts) that don't require a potfolio of compositions...you should do some research in this forum to find some "safer" schools....
My personal suggestion would be taking 1 or 2 years of private lessons just to be more prepared and listening to several composers...to understand specifically what does he want to do...i mean if he wants to write film music i think he should avoid places like Julliard, MSM ...or, if he is interested in composers like Cage, Glass ecc he should look at places like Oberlin...
I'm 23 from Italy and studied privately composition a couple of years ...I applied to 4-5 Music schools (including boston Cons, Peabody, Longy)...but believe me i'm VERY scared that no one will accept me ....especially after hearing that Boston Conservatory accepts ONLY 4 compositions students every year (and they recieve 1700 applications), Peabody around 10 - 15 (and recieve even more applications) ecc..........I'm already preparing my stuff to apply in a Conservatory here in Italy

So this is what i know, i'm sure a lot of people here can give you more details about good schools that are not so selective...
Hope this helps
Francesco (sorry 4 my english)