George Kennedy was 34 in Spartacus when he played the character 'Rebel Soldier (uncredited)'.
That was over 64 years ago in 1960.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2016 he died aged 91, starring in 116 films in his career, 115 of those after Spartacus was first released. If he were alive today he would be 99.
In Spartacus, I think George Kennedy looks: