There's nothing really new age about the archetypal quest mythos. Whether it's Homer's Odyssey, medieval Grail lore, Browning's Childe Roland or Stephen King's Dark Tower series, or in fact Oz, the theme of a journey of self-discovery is about as old as the hills. Apparently there's something about it that speaks to the human experience since it keeps resurfacing :-)
As I stated,
1. Oz was a new-age version in which they find the answer inside themselves.
2. Whereas in the age-old version they find the answer in God.