Marilyn Monroe was 31 in Some Like It Hot when she played the character 'Sugar Kane Kowalczyk'.
That was over 65 years ago in 1959.
In 1962 she died aged just 36, starring in 94 films in her career, 66 of those after Some Like It Hot was first released. If she were alive today she would be 98.
In Some Like It Hot, I think Marilyn Monroe looks: