That was over 6 years ago in 2016.
Today he is 30, and has starred in 9 movies in total, 2 since Deepwater Horizon was released.
In Deepwater Horizon, I think Dylan O'Brien looks:
Deepwater Horizon scores 6.6 out of 10 on The Movie Database.
Dylan O'Brien's first acting role was as 'Charlie Brown' in Charlie Brown's Blockhead Revenge, released in 2011 when he was 20.