Robbie Coltrane was 27 in Waterloo Sunset when he played the character 'Jimmy'.
That was over 45 years ago in 1979.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 74, and has starred in 89 movies in total, 90 of those since Waterloo Sunset was released.
In Waterloo Sunset, I think Robbie Coltrane looks: