The chicken pox vaccine was originally developed and released in parts of Asia in the late 80s, but didn't become widely available in North America until the mid-late 90s. I was already in junior high when it was released up here in Canada and had caught it years earlier, when I was around 5 or 6, so I was never given the vaccine. As far as I know, the US released it a couple of years before we did, though I could be wrong about that.