how old was dylan o'brien in maze runner

Dylan O'Brien was born on August 26, 1991. The Maze Runner movie was released on September 19, 2014. Given that the movie was likely filmed in 2013 (principal photography from May to July 2013), Dylan O'Brien would have been about 21 years old during filming of The Maze Runner, while his character Thomas in the story is 16 years old.