That was over 10 years ago in 2011.
Today she is 38, and has starred in 32 movies in total, 17 since Arthur was released.
In Arthur, I think Greta Gerwig looks:
Arthur scores 5.4 out of 10 on The Movie Database.
Greta Gerwig's first acting role was as 'Greta' in LOL, released in 2006 when she was 22.