The Publication Order vs. Chronological Order Debate
If you buy this 2023 box set, there is a high chance the books are numbered 1 through 7 starting with The Magician's Nephew. Ignore the numbers.
C.S. Lewis wrote The Lion, the Witch and the Wardrobe first, and that is where the magic should begin. Starting with the prequel (The Magician's Nephew) is like watching the Star Wars prequels before the original trilogy—it sucks the mystery out of the world. Start with the Pevensies in the wardrobe, then move through the series in publication order.
Why It Still Works
What makes Narnia hold up better than, say, The Swiss Family Robinson, is the psychological realism of the kids. They bicker, they make selfish choices, and they feel real fear. Edmund's betrayal in the first book isn't some mustache-twirling villainy; it's the result of being a younger brother who feels overlooked and gets bribed with some high-end candy.
Modern kids used to the fast-paced, snarky tone of Percy Jackson might find the narrator's voice a bit formal at first, but once the action hits—the battle for Beruna or the sea voyage in Dawn Treader—they're usually hooked.
A Note on the Ending
The Last Battle is the most controversial book in the set. It’s weird, it’s dark, and it gets very heavy on the 'end-of-the-world' imagery. Some parents find it a bit much, while others find it the most profound of the bunch. Just be prepared for some big 'Wait, what just happened?' questions when you hit the final chapters.