Show him what you can do with programming. Show him something cool, which is still reachable so he can imagine himself doing that. Just some lame "you will get good jobs after 100 years" thing doesn't fly I think. For me the "defining moment" was when I saw Scandinavian "demo-scene" stuff at the age of roughly 11. After that, I really died to learn 3D-programming, and I've been coding pretty much every day since.
:) I started with C, but it seemed so complicated and difficult to learn that I moved to x86 assembly, and learned that way. Couple of years later of course moved back to C, but that time with different perspective already -- as the projects grow in complication there was need for something more high-level. Pretty much same way ended up in OO-programming, I noticed I was more or less doing OO-programming already but just cumbersome way, so transitioned to C++... But anyway, get books, lots of them. I've met some programmers who have never read a programming book, but I still believe clearly organized and though-out book is a much better way to learn something "right way" even if basically all the information is in Internet.