Nathan Fillion was 41 in Justice League: The Flashpoint Paradox when he played the character 'Hal Jordan / Green Lantern (voice)'.
That was over 11 years ago in 2013.
Today he is 53, and has starred in 43 movies in total, 21 of those since Justice League: The Flashpoint Paradox was released.
In Justice League: The Flashpoint Paradox, I think Nathan Fillion looks: