Celebrity·Posted on May 3, 2017Try To Guess How Old The "Teens" In "13 Reasons Why" AreSpoiler: Only one of them is a true teen!by Michelle RegnaBuzzFeed StaffLinkFacebookPinterestTwitterMailBuzzFeed Quiz Party! Take this quiz with friends in real time and compare resultsCheck it out! Because 13 Reasons Why takes place in high school, the majority of the characters are 16–18 years old. That being said, ya kinda gotta wonder how old some of these actors actually are IRL.