If This Be Sin 1949- Myrna Loy, Peggy Cummins, Richard Greene, Roger Livesey, Elizabeth Allen, Gerard Heins, Jean Cadell, Margaret Withers

That Dangerous Age is a 1949 British romance film directed by Gregory Ratoff and starring Myrna Loy, Roger Livesey and Peggy Cummins. It was adapted from the play Autumn by Margaret Kennedy and Ilya Surguchev. The film was released under the alternative title of If This Be Sin in the United States.