Garrett Hedlund was 18 in Troy when he played the character 'Patroclus'.
That was over 19 years ago in 2004.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 38, and has starred in 31 movies in total, 23 of those since Troy was released.
In Troy, I think Garrett Hedlund looks: