I'm 28 so that puts me "up there" I guess.

I have to say I was terribly disappointed with the series, especially since reading on the back that Meyer has a degree in English Lit. All of the characters lacked depth (except maybe Jacob, who was by far my favourite character for this reason) and it makes the whole story rather flimsy. Putting aside their supernatural aspects, Edward and Bella just aren't believable as "real" people.
As an editor in the Literature category I'm glad to have read the stories so that I can be a better help to quiz authors writing about Meyer's stories, but I doubt I'll ever read them again myself. As far as teen books go, "Twilight" and its sequels are average at best.