Christina Ricci was 9 in Mermaids when she played the character 'Kate Flax'.
That was over 33 years ago in 1990.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 44, and has starred in 65 movies in total, 64 of those since Mermaids was released.
In Mermaids, I think Christina Ricci looks: