Who can forget Amy Poehler as Regina’s mom? In the movie, she plays a middle-aged parent desperately trying to recapture her youth who seeks the approval of her daughter and her daughter’s friends. In real life, however, Poehler is only seven years older than the actress who played Regina, Rachel McAdams. Mean Girls was released on April 30, 2004, making Poehler just 32 when it hit theaters. McAdams was 25.
In fact, out of the clique known as The Plastics, Lindsay Lohan, at 17, was the only one who was actually high school aged. Amanda Seyfried was 19, and Lacey Chabert turned 21 during filming. Other pivotal characters were also played by actors who were quite a bit older than they were. Jonathan Bennett, who played Aaron Samuels, was 22; Lizzy Caplan, who played Janis Ian, was 21; and Daniel Franzese, who played Damian, was 25.