This document discusses common stereotypes associated with different age groups. Stereotypes are overgeneralized beliefs about social groups. For each age group - teenagers, old people, middle age, and children - the document explores how they are commonly stereotyped, why these stereotypes are used, how their representation has changed over time, and relevant theories around stereotypes. Behind each stereotype is often some element of truth, according to theorist Tessa Perkins. For example, statistics show teenage crime and antisocial behavior has risen in recent years.