Which Types Of Thriller Could Appeal To Different Audiences?

Every Film that is released has to have a target audience or it will not be successful, many thriller films will have a target audience of 15+ or 18+, this is due to the fact that a film if a film is rated 12+ for example it will not be able to have the same content within it, for example sex, drug use and violence, this would make the thriller less scary and therefore flaw the reason it was first made.
There are many different sub-genre’s associated with thriller films and some of these are espionage, futuristic and teenage thriller’s, there are also many hybrid’s associated with thriller films such as comedy, erotic, action and science fiction thrillers, each of these different types of thriller’s attracts different audiences for example an science fiction thriller may attract an audience whom are fan’s of both thriller’s and other science fiction cinema, one such film would be ‘28days later’.