hey, be nice to the kid...
medicale: there are some discussions on this already, but here are my two cents...
each year 150 people enter neurosurgical residencies in the entire country of 300+ million. each year only 150 new neurosurgeons are made. so when you're the only neurosurgeon in the area and a patient presents at 3am with a burst berry aneurysm, are you going to say "no, i'm not on tonight" and let them die if no other capable individual is available? that's a start to the thought process...
it is possible to limit your hours, but given the scarce numbers of neurosurgeons out there, and the fact that the vast majority do undertake "truculent hours", don't expect to be the exception. the people who go into neurosurgery generally go in with the expectation of working long hours throughout their life; if nice hours are what you want, though possible (albeit somewhat rare), you should consider a different profession
my brother is 14; he's awaiting harry potter book 7. i suggest you not worry about such things now; there's nothing you can do now to ensure a spot in neurosurgical residency. heck, i doubt there's a lot you can do now (are you a freshman in hs yet?) to even help out with a college application, much less medical school. such thoughts come to one as they live through life. don't force it, better to live and find out your own personality, and then see if you're a born match for neurosurgery. if not, there are still other great, interesting medical fields out there without the time commitment (rads, derm, ophtho, even ortho)
good luck