- A prejudice and/or discrimination against the young.
- 2009 September 29, Libby Brooks, “We must listen to children and young people first”, in Guardian:
- To speak of "childism" is to court derision, and conjure a nightmarish totem of the bolshy teen threatening to call ChildLine when his parent or teacher scolds him.
- A systemic condition that promotes stereotypes of the young.
- Young-Bruehl, Elisabeth (2009), Childism — Prejudice Against Children