Ciarán Hinds was 25 in The Long March when he played the character 'Michael Canning'.
That was over 43 years ago in 1980.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 70, and has starred in 92 movies in total, 89 of those since The Long March was released.
In The Long March, I think Ciarán Hinds looks: