Hello. Glad to have you on board.

I can only speak from personal experience. I'd learned quite a bit about the movies through pop cultural osmosis (no spoilers really, but I knew what an R2-D2 was, what Darth Vader looked like, etc) through parodies and stuff in shows like Muppet Babies in the '80s. I only first saw the films when I was nine, and that was definitely old enough to enjoy them and appreciate them. I'd honestly say that's a perfect age: you're just starting to become somewhat sophisticated and intelligent in your viewing choices, you've long since been mature enough to sit still for the duration of a movie and pay attention, and you're old enough to appreciate the narrative and not find it too scary. You could probably get that reaction from younger kids too, like maybe around seven. Of course, it really depends on your kids. Honestly, I don't really think there is a "too young" because, if they like it, they'll keep watching the movies and grow to more fully appreciate them, but I can certainly understand why you'd want their first viewing experience to be special.

I don't have any kids, though, so maybe those here who have can shed a little more light on how things have gone with their own offspring.