That was over 5 years ago in 2017.
Today he is 29, and has starred in 19 movies in total, 2 since Justice League was released.
In Justice League, I think Ezra Miller looks:
Justice League scores 6.4 out of 10 on The Movie Database.
Ezra Miller's first acting role was as 'Robert' in Afterschool, released in 2008 when he was 16.