Planning - Target Audiences

We have decided that our target audience will be a mix of females and males from the ages of 15-18. We think that this is appropriate as there will be scenes of violence so people under the age of 15 may not like this and people over the age of 18 may not enjoy it too, as they may think it is only suitable for teenagers. Both genders may like this film as it can appeal to all and isn't orientated to just one type of gender.