Penny Is Youngest

Believe it or not but Penny is the youngest character on the big bang theory both in reel and real life. In fact Sheldon cooper AKA Jim Parsons is 13 years older than her. Johnny Galecki and Mayim Bialik both 10 years older than her.
This Post Belongs To 8 Things You Don't Know About Penny AKA Kaley Cuoco