An excellent article from Frederica Mathewes-Green:
I’m a fan of old movies, the black-and-whites from the 1930s and 1940s, in part because of what they reveal about how American culture has changed. The adults in these films carry themselves differently. They don’t walk and speak the way we do. It’s often hard to figure out how old the characters are supposed to be—as though they were portraying a phase of the human life-cycle that we don’t have any more . . .
Characters in these older movies appear to be an age nobody ever gets to be today. This isn’t an observation about the actors themselves (who may have behaved in very juvenile ways privately); rather, it is about the way audiences expected grownups to act. A certain manner demonstrated adulthood, and it was different from the manner of children, or even of adolescents such as Judy Garland and Mickey Rooney . . .
Today actors preserve an unformed, hesitant, childish quality well into middle age. Compare the poised and debonair Cary Grant with Hugh Grant, who portrayed a boyish, floppy-haired ditherer till he was forty. Compare Bette Davis’ strong and smoky voice with Renée Zellweger’s nervous twitter. Zellweger is adorable, but she’s thirty-five. When will she grow up? . . .
In a review in the Village Voice of the film The Aviator, Michael Atkinson dubbed our current crop of childish male actors “toddler-men.” “The conscious contrast between baby-faced, teen-voiced toddler-men movie actors and the golden age’s grownups is unavoidable,” he wrote. “Though DiCaprio is the same age here as Hughes was in 1934, he may not be convincing as a thirty-year-old until he’s fifty.” Nobody has that old-style confident authority any more. We’ve forgotten how to act like grownups . . .