Carrie Fisher was 31 in The 'Burbs when she played the character 'Carol Peterson'.
That was over 34 years ago in 1989.
In 2016 she died aged just 60, starring in 97 films in her career, 62 of those after The 'Burbs was first released. If she were alive today she would be 66.
In The 'Burbs, I think Carrie Fisher looks: