Billy Connolly reckons films need to reflect real life - by having more mature characters.
Billy said: "It's a very modern thing, this dependence on youth. If you get old black and white movies like Dial M For Murder, those movies in the 40s right up until the 50s, movies were all full of old people. There were hardly any young people.
"The young people were played by people in their 30s or 40s. The young crumpet would be 35 or 38, mincing around. There was a change in the 1950s. I think they invented the teenager in the 1950s and there was no such thing before that. And they stuck them in everywhere they could."
He added; "I hope they just get back to the way they did before or a mixture of the both and use older actors. Instead of having the token old one like Driving Miss Daisy every now and again. Have it the way life is, a mixture."
Many of the supporting cast of the film - directed by Dustin Hoffman - are real-life musicians.
"That was one of the better parts of the film, that they were real musicians and they play all the time like real musicians do. You can't stop them," Billy said.
"Between takes you feel them playing. And they hadn't had a phone call in 20 years (to perform) most of them. They're all superb. They were all lead players, ace players, but they hadn't been asked to work because of their age."
:: Quartet is released in cinemas on January 1.