I read the first Harry Potter book a week ago and I can really see what the hype is about, but I would probably have enjoyed it much more if I had been younger.
But to be honest I feel like Percy Jackson have filled that hole in my chest, I read the first Harry Potter book at the age of 13 I think and he was 12 at that time, so we were very close to age, and the first book was just fantastic. I have been reading about Percy and his friends, their enemies and the Gods ever since then, and the story is not over yet. I used to say that when the last Mortal Instruments book comes out is the day I stop being a child but that's not true. My last childhood page will be turned the second I turn the last page in Heroes of Olympus.