Well, I got the Basic & Expert D&D sets for Xmas when I was in 3rd grade but I didn't really have much to do with roleplaying except reading them until a year later when we moved and I discovered Traveller's little black books that I could buy one a week of with my allowance and plenty of people wanted to play (which makes some sense, since everyone's parents pretty much worked for the Air Force or NASA where I was at in Huntsville.
But really the whole thing can actually be blamed on Squad Leader, which kind of kicked the "games in boxes shaped like this are way cooler than Monopoly" notion in the first place. Wargames with my father used to be a really big deal, I suppose because it was an opportunity for him to steer me towards military history and perform an activity with me in his study surrounded by thousands of books that I inevitably read.