The social norm is constructed: not naturally occurring but created by the society in which it is found.
Hence there are no actions which in themselves are inherently #abnormal or universally condemned by all societies at all times. Deviance is thus situational and contextual.
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."