When Hugh O'Brian is first seen in this movie, he's bare-chested. When Cliff Robertson is first seen, he's bare-chested. When Ron Husmann is first seen, he's bare-chested.
Ruth Roman (December 1922), Hugh O'Brian (April 1923) and Cliff Robertson (September 1923) were all born within a nine-month period.
When asked, Irene tells Margot that Margot looks like she's in her late 30's. Ruth Roman was 42 when this was filmed.