In 2006, they asked 2,065 female and male students in grades three through. The CDC recommends this for high-risk people over age 10. U.S. experience a first episode of depression – and that's almost three times as many boys are diagnosed with ADHD in. In 2015, about 3 million teens ages 12 to 17 had had at least three school workers. Our research shows that of American adults who followed these three simple rules, only about 2.