Jason O'Mara was 43 in The Siege of Jadotville when he played the character 'Sgt. Jack Prendergast'.
That was over 8 years ago in 2016.
Today he is 51, and has starred in 24 movies in total, 8 of those since The Siege of Jadotville was released.
In The Siege of Jadotville, I think Jason O'Mara looks: