I'm not sure which age you're referring to. I think part of it is not dumbing things down. A great children's book will also be a great book to adults as well ( though not the reverse, lol). I think children tend to be more imaginative, openminded, and open to possibility. They don't tend to be cynical, and are prepared to be awed and astounded. They enter more deeply into things, and they tend to live in the present more than adults do. I still remember The Black Stallion series by Walter Farley. I still dream images of visuals that haunted my imagination from that series, particularly The Red Stallion.Tarzan, by Edgar Rice Burroughs, and C.S Lewis's the Lion the Witch and the Wardrobe series effected me the same way and began a lifelong love of books. I've never purposely killed a spider since reading Charlote's Web. One thing all these books did was place the main characters in situations where they had to face and surmount danger and deal with adversity, and grapple with emotional situations and moral dilemmas and grow. What the main characters did MATTERED They also plunged you into wonderful worlds that fired and fed the imagination. I can still remember the scene when Tom Sawyer and Becky were lost in a cave. It was as frightening to me then, and as alien and fantastic as any horror or fantasy novel I've read since. I sometimes dream that too. I don't know if they still write most childrens books this way, but I think the ones I've mentioned all became beloved classics for just those reasons, and honestly, I would happily read any of them again.