@kwantumkraut @etherdiver @Binder
I read Ender's Game around that age, though not fantasy. Um...ALL of Pratchett's stuff is pretty easy for kiddos to appreciate, IMHO, but...let's see...oh!
I started reading Roger Zelazny's the Chronicles of Amber at that age. There are 10 full books. There are some references to sexuality but nothing explicit, and it is just...AMAZING. Dune level world building. Fantastic, deep characters with logical motivations for the heinous shit they do.
Amber was a formative series for me, probably beyond even...oh! Another GREAT series, the Dragonriders of Pern.
Anyway, Amber has swashbuckling, treachery, honor, reevenge, redemption, 70s style pulp campiness, meddling in the abstract machinations of slightly Lovecraftian gods, just...
Like, I think EVERYONE should read it.
Edit: check with parents though, it is an adult series with lots of grownup themes, violence, etc. Like if John Carter of Mars was duplo blocks with smut, then Amber is a Lego technic set with the occasional non-graphic bang occuring