Dakota Fanning was 6 in Tomcats when she played the character 'Little Girl in Park'.
That was over 23 years ago in 2001.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 30, and has starred in 53 movies in total, 51 of those since Tomcats was released.
In Tomcats, I think Dakota Fanning looks: