According to the Dove 2021 CROWN Research Study for Girls, 53% of Black mothers in the U.S. who have daughters who have experienced hair discrimination endured it as early as five years old. The same study suggests that approximately 86% of Black teens who have experienced it did so by the age of twelve.
https://www.adweek.com/brand-marketing/dove-ad-reminds-all-that-discrimination-against-black-hair-starts-as-early-as-five/