How old is Vanessa Haywood from district 9 movie?

There is no character named Vanessa Haywood in the movie District 9. The main female character in the film is Wikus van der Merwe's wife, Tania van der Merwe. Her age is not explicitly stated in the movie, but she is likely in her late 20s or early 30s.

It is possible you are thinking of a different character or a different movie altogether. Please double-check the information you have.