YA books for Adults who don't read YA" I've read a lot of these abd I completely agree non-traditional YA readers should give them a try. The Diviners was great and The Knife of Never Letting Go was phenominal, I read that whole series!
Orson Scott Card has written another book with a very young hero. This one includes time travel. In his own words he decided not to defend against paradox but rather to embrace it. While the main character is 14 years old, it is not a teen or young adult book exclusively. It's part of a series so, while it has a definite ending, is not the complete story. There is definitely more to come.