
We know not to judge a book by it's cover (OK, I'll admit to being influenced by interesting book jackets), but do you know not to judge books by their genre? Some of my best best reads have been from the YA literature genre - The Hunger Games trilogy, Graceling, The Book Thief, The Absolutely True Diary of a Part-Time Indian and many more. Don't deprive yourself of a great story by assuming these books are 'too young' for you.
For more young adult reading suggestions, check out the article Hooray For YA: Teen Novels For Readers Of All Ages (Delirium by Lauren Oliver was very good) or this Never Too Old book list.