Let me start off by saying that as the youngest of four kids by 10 years, I saw pretty much whatever I wanted from a very early age. I realize it might sound hypocritical that someone who saw 'Flashdance' when she was eight and 'The Exorcist' a year later should deem a mostly chaste vampire-drama like 'The Twilight Saga: Eclipse' verboten for little kids. But I'm a mother now, and I'm also a professional movie reviewer who spends at least 10 hours a week thinking and writing about the age-appropriateness of various movies. So after much consideration I believe that 'Eclipse' is not for most elementary-schoolers, with the possible exception of very mature 11- and 12-year-olds (as in, those you'd feel comfortable talking about teenage relationships and sex and marriage with).
Yes, I know Stephenie Meyer's 'Twilight' books are a young-adult series that even precocious 8- and 9-year-olds could read. But that doesn't mean they should read the books (particularly 'Breaking Dawn'). Before you flame me for being a hater, I'd like to add that I read (more like devoured) the first three books in spring 2008 and a few months later dragged my then-43-year-old sister to the 'Breaking Dawn' release party at a Barnes & Noble that August. I experienced first-hand the emotional pull of the Bella-Edward romance and the Bella-Jacob relationship. I, like millions of other readers, got swept up in the romance with a capital R.