A child doesn't have stress I've heard from several people including my parents' when that was a psycholoist's diagnosis of my problems when I was nine.

The other one came from a coworker when we were reading a statistic about the numbers of depression cases at various ages and I complained that it only started at age 20 or 25.

Holy crap, I was depressed from about age nine through most of college.
I think I was switching between just unhappy and actually depressed through all of school. It'd be really interesting to see that complete statistic ...