I choose: Harry Potter (duh!), Percy Jackson and the Olympians (with Heroes of Olympus), Lord of the Rings, Hunger Games, Keeper of the Lost Cities (a not-very-well-known series but a very good one), Inkheart series and Empress of All Seasons (not a series, but still very good). I read them all when I was ten years old (except for the Harry Potter series, which I read at age 8), and some might be slightly scary.
School for Good and Evil is an okay series, I just didn't like that there was too much romance (I read it at age 9) but it's an okay series, the plot is very interesting.
I'm gonna start reading Chronicles of Narnia, they seem interesting and maybe Game of Thrones and Graceling when I'm older (like at age 13 or 14).