Jason O'Mara was 46 in Justice League Dark: Apokolips War when he played the character 'Bruce Wayne / Batman (voice)'.
That was over 4 years ago in 2020.
Today he is 51, and has starred in 24 movies in total, 1 of those since Justice League Dark: Apokolips War was released.
In Justice League Dark: Apokolips War, I think Jason O'Mara looks: