I'm married to a Star Wars fan. Star Wars practically defined his childhood.
Our daughter is named after a character. (Which is ok with me; in fact it was originally my idea, DH of course LOVED it and kept checking for months to make sure I was really serious that it was ok).
She's 4 and has seen all of them except Episode III. No problems for her, she is not at all afraid of that stuff. I'm not proud of this or anything, it just is the truth. I don't think she really understands that there are actually truly scary things in the world yet, and I'm happy about that at least.
DH remembers begging his mother to take him to see Star Wars as a kid, and she said no, and no, and no, and finally told him ok. So she took him to see... the Muppets. DH was extremely upset, he flipped OUT and finally she took him to see the real Star Wars
He vividly remembers the first time he saw Darth Vadar on the screen, he was so excited he was jumping up and down.
I'm not anti-Star Wars but not really a sci-fi fan. And I like Star Trek better anyway. I love the social commentary.