Audiences of Thriller in my opinion can be debated. Age restrictions minus out a child audience of Thrillers. However, the target audience for Thriller would be aimed at 16-25 year olds, as the majority of people who watch Thrillers are sudents. However, adults also enjoy watching Thrillers.
A Male audience is more likey to be attracted to a thriller film because of the action and crimes in them. However, some Thrillers attract a Female audience too due to the casting roles. If a role model for woman was cast in a thriller, this would attract more woman to watch the film. Some Thrillers can involve both sexual scenes and forbidden romance, which attracts both females and males. However, as a whole, the target audience for a Thriller movie is in fact men in between the ages of 16 to 25 years.
UK Cinemagoing By Genre in 2009.
Here are the figures for the suspense films released in the UK in 2009.
Above shows the income of suspense/thriller films that were made in 2009. It shows that only 4% of the films were the years box office. Which is a very small number compared to how many comedy's are successful at box office.