Lois Maxwell was 35 in The Haunting when she played the character 'Grace Markway'.
That was over 61 years ago in 1963.
In 2007 she died aged 80, starring in 60 films in her career, 32 of those after The Haunting was first released. If she were alive today she would be 97.
In The Haunting, I think Lois Maxwell looks: