Jai Courtney was 18 in Boys Grammar when he played the character 'Alex'.
That was over 19 years ago in 2005.
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 27 movies in total, 23 of those since Boys Grammar was released.
In Boys Grammar, I think Jai Courtney looks: