Hollywood has never been especially strict about checking birth certificates at the school gates. Plenty of actors have walked into fictional classrooms, worried about prom, and survived teenage drama long after leaving their own adolescence behind. Clever styling, youthful features, and a generous suspension of disbelief helped some pull it off convincingly, while others looked suspiciously ready to refinance a mortgage. These 15 stars played teenagers despite being considerably older than the characters they were supposed to portray.
