Katharine Hepburn was 29 in Bringing Up Baby when she played the character 'Susan Vance'.
That was over 86 years ago in 1938.
In 2003 she died aged 96, starring in 93 films in her career, 78 of those after Bringing Up Baby was first released. If she were alive today she would be 117.
In Bringing Up Baby, I think Katharine Hepburn looks: