At what age did you lose your child-like view of the World?

I lost mine at about 11-12 around Christmas. I remember I didn't particularly like that one.. For a while I felt like I didn't like Christmas. That's when I realized that the World could be a dreadful place. No particular reason, just an accumulation of things... Also living in a rough neighborhood..

At what age did you lose your child-like view of the World?
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