Olivia Thirlby was 18 in United 93 when she played the character 'Nicole Carol Miller'.
That was over 18 years ago in 2006.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 37, and has starred in 34 movies in total, 32 of those since United 93 was released.
In United 93, I think Olivia Thirlby looks: