Sigourney Weaver was 30 when she played the iconic sci fi role
exactly and her performance was extraordinary. Putting a great effort at work. 
I want to say that's her first big acting role. It was very eerie and holds up to one of the creepiest
she said after getting the script, the whole first day was just a mere talk about it. she just want to be part of the crew.
Hmm that is interesting. The budget was a measly $18 million but grossed over $130 million!