Liam Hemsworth was 18 in Knowing when he played the character 'Spencer'.
That was over 15 years ago in 2009.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 34, and has starred in 27 movies in total, 23 of those since Knowing was released.
In Knowing, I think Liam Hemsworth looks: