That was over 4 years ago in 2017.
Today he is 48, and has starred in 71 movies in total, 3 since Justice League was released.
In Justice League, I think Ben Affleck looks:
Justice League scores 6.4 out of 10 on The Movie Database.
Ben Affleck's first acting role was as 'Tommy' in The Dark End of the Street, released in 1981 when he was 8.