That was over 6 years ago in 2015.
Today he is 31, and has starred in 13 movies in total, 3 since Chappie was released.
In Chappie, I think Dev Patel looks:
Chappie scores 6.6 out of 10 on The Movie Database.
Dev Patel's first acting role was as 'Jamal Malik' in Slumdog Millionaire, released in 2008 when he was 18.