Popsugar Entertainment Booksmart How Old Is the Booksmart Cast? Here's How Old the "Teens" Are From Booksmart (Hint: They're Not Teens) 10 May 2019 by Amanda Prahl View On One Page Photo 1 of 7 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 Kaitlyn Dever aka Amy: 22 Previous Next Start Slideshow BooksmartMovies