Marlene Dietrich was 55 in Witness for the Prosecution when she played the character 'Christine Vole'.
That was over 66 years ago in 1957.
In 1992 she died aged 90, starring in 81 films in her career, 28 of those after Witness for the Prosecution was first released. If she were alive today she would be 122.
In Witness for the Prosecution, I think Marlene Dietrich looks: