Troye Sivan was 12 in X-Men Origins: Wolverine when he played the character 'James'.
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 28, and has starred in 9 movies in total, 8 of those since X-Men Origins: Wolverine was released.
In X-Men Origins: Wolverine, I think Troye Sivan looks: