https://www.europol.europa.eu/crime-areas-and-statistics/crime-areas/child-sexual-exploitation
quote:
Child sexual exploitation refers to the sexual abuse of a person below the age of 18, as well as to the production of images of such abuse and the sharing of those images online.
Your post clarifies they ban content of "youngsters" being not obviously underage, it's not the same legally as to say someone is 18+ years old.