As another who is still (pretty much) a kid I agree with Matthew. I started off following my father to airshows and was hooked in a matter of months. Before I could read I had been through and learned all of the aircraft in my fathers recognition guides. From there my interest just got bigger and it continues to do so every day. As I got older I began to ask my grandpa questions, not about his experiences per-se but things, like 'did he have a Tommy gun' and 'did he ever drive a Jeep.' Of couse each question turned into a story, which my brother and I are now recording. One final thing, don't forget in the UK we have the finest resource for getting kids interested in WW2: Commando Comic! From the age of about 8 I read every one I could get my hands on, got a subscription eventually and was tearing through them right up until secondary school (makes me laugh that the day I bought my last Commando I also bought Catch 22). They are actually quite complex, with a clear destinction between 'good' and 'bad' but often with a 'sympathetic baddie' just to show the Germans aren't all rotters kind of thing. An excellent place for a youngster to start, now available in large volumes at waterstones.