 Biden is using a stat on gun deaths of children and teens, meaning it includes deaths of 18 and 19-year-olds who are legally considered adults in most states. They might be getting killed in gang wars. When you focus only on children 17 and younger, motor vehicles, yeah, broadly defined, is number one, as they have been for six decades. The gap is rapidly closing. Deaths of children from gun violence have increased about 50% from 2019 to 2021.