That was over 41 years ago in 1981.
Today he is 71, and has starred in 86 movies in total, 80 since Excalibur was released.
In Excalibur, I think Gabriel Byrne looks:
Excalibur scores 7.1 out of 10 on The Movie Database.
Gabriel Byrne's first acting role was as 'Uther Pendragon' in Excalibur, released in 1981 when he was 30.