Kiernan Shipka was 6 in Dimension when she played the character 'Molly'.
That was over 17 years ago in 2007.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 24, and has starred in 23 movies in total, 17 of those since Dimension was released.
In Dimension, I think Kiernan Shipka looks: