Caitlin Carmichael was 5 in Backlight when she played the character 'Jamie'.
That was over 14 years ago in 2010.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 19, and has starred in 25 movies in total, 24 of those since Backlight was released.
In Backlight, I think Caitlin Carmichael looks: