 Now, to get there, here's what you do. You add 18-year-olds. Hey, Brady, is an 18-year-old a kid? Nope. Then you add 19-year-olds. Brady, is an 18-year-old a kid? Nope. And then you have to add suicides, because even if you add 18 and 19-year-olds, you still don't get to the leading cause of deaths in youths in the United States is guns. You have to add suicides.