Rough contact and impact peak around the age of seven. This is gradually replaced by peer monitoring in the years that follow.
Isabelle Clair: "Adolescence is a very normative age. At middle school, "there's a very tough relationship to what's the right thing to do".
Margot Déage: "Physical violence is much more prevalent in elementary/primary school, then decreases in middle school, and progressively through high school."