Sigourney Weaver was 37 in Gorillas in the Mist when she played the character 'Dian Fossey'.
That was over 36 years ago in 1988.
Today she is 74, and has starred in 114 movies in total, 101 of those since Gorillas in the Mist was released.
In Gorillas in the Mist, I think Sigourney Weaver looks: