That was over 23 years ago in 1998.
Today he is 50, and has starred in 82 movies in total, 70 since Rounders was released.
In Rounders, I think Matt Damon looks:
Rounders scores 6.9 out of 10 on The Movie Database.
Matt Damon's first acting role was as 'Steamer' in Mystic Pizza, released in 1988 when he was 18.