Brad Dourif was 24 in One Flew Over the Cuckoo's Nest when he played the character 'Billy Bibbit'.
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 73, and has starred in 138 movies in total, 135 of those since One Flew Over the Cuckoo's Nest was released.
In One Flew Over the Cuckoo's Nest, I think Brad Dourif looks: