Billy Connolly was 31 in Just Another Saturday when he played the character 'Paddy'.
That was over 48 years ago in 1975.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 80, and has starred in 107 movies in total, 107 of those since Just Another Saturday was released.
In Just Another Saturday, I think Billy Connolly looks: