Richard Burton was 22 in The Last Days of Dolwyn when he played the character 'Gareth'.
That was over 75 years ago in 1949.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 1984 he died aged just 58, starring in 89 films in his career, 89 of those after The Last Days of Dolwyn was first released. If he were alive today he would be 98.
In The Last Days of Dolwyn, I think Richard Burton looks: