Anna Chlumsky was 7 in Uncle Buck when she played the character 'School Child'.
That was over 35 years ago in 1989.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 43, and has starred in 18 movies in total, 17 of those since Uncle Buck was released.
In Uncle Buck, I think Anna Chlumsky looks: