I was watching scrubs last night, and I realise Zach has the hair of a 12 year old!!
Could this be a full-cap wig? I think so... It looks totally unrealistic for his age - it's ultra thick. The hairline is like a "wall of hair" and is totally 100% dark with no scalp showing through the hair whatsoever. It struck me straight away that this was probably a well styled wig.
Even at the sides you will notice that he doesn't expose any temple points - the hair is brushed in a way that disguises any recession. It just doesn't look realistic to me, and is "too good to be true" overall.
I had doubts it was a system, but I think with the right materials he has created realistic temples and a very nice hairline (that is just a little too thick for his age).
If he was 12 it would have worked, but come on man... bump that density down a little!