Teenagers still would've gone to see it, and it would've garnered a much larger adult audience. DVD sales would've been just as high, if not higher.
In general, teenagers dig the whole gore, violence, and swearing stuff anyway. You're more likely to put them off a movie by not
having any of it in the movie, then having the levels of, say, Predator
And I can't really believe people have been waiting nearly twenty years for a pizza boy, ex-con, sheriff who, dangit, just don't quite get the respect he deserves and a war-mum reconciling with her estranged family in a tube-top to save the day against Aliens and Predators duking it out in their hometown on modern-day Earth