Which Pretty Little Liars Star Is Older: Troian Bellisario or Janel Parrish? 1 of 2 Prev Autoplay Next Share Tweet December 7, 2012 at 04:20PM EST by Molly Friedman Related: Pretty Little Liars, Troian Bellisario, Janel Parrish full size Credit: Getty Images Which Pretty Little Liars Star Is Older: Troian Bellisario or Janel Parrish? They both play high school seniors on Pretty Little Liars, but in reality Janel Parrish (Mona Vanderwall) and Troian Bellisario (Spencer) have long since graduated. But you may be surprised to learn which actress is a full three years older than the other. Click on the next photo to find out!