Would a 7-year-old child understand that magic isn't real?

When do children understand that ghost, magic, fantasy concepts, etc., aren’t real? At what age? I know this depends on the kid, but, say, the kid is raised by mature, responsible, and educated parents?

Also, at what age are children able to feel strong resentment (possibly revenge) when their parents or loved ones are badly mistreated, even taken away, and that leaves a deep scar in them?