Mary Mouser was 7 in Son of the Mask when she played the character 'Alvey Avery (voice)'.
That was over 19 years ago in 2005.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 27, and has starred in 13 movies in total, 12 of those since Son of the Mask was released.
In Son of the Mask, I think Mary Mouser looks: