Robert Knepper was 55 in The Hunger Games: Mockingjay - Part 2 when he played the character 'Antonius'.
That was over 8 years ago in 2015.
Today he is 64, and has starred in 79 movies in total, 25 of those since The Hunger Games: Mockingjay - Part 2 was released.
In The Hunger Games: Mockingjay - Part 2, I think Robert Knepper looks: