Ferris Bueller’s Day Off and Grease are just two of the many iconic high school movies that have earned a more permanent place in our hearts than our own graduating class. But as much as we think we know their stories inside and out, we often forget their central lie: Their stars were way older than their roles. Prepare to be amazed (or at least to laugh knowingly!) as we take a look at some hit TV shows and movies — from The Graduate to High School Musical, Beverly Hills 90210 to Buffy — starring actors who aren’t exactly age appropriate for the parts they play. Check out the full gallery of the 30 over-aged actors who managed to fool us!