Research - Target Audience

Before I started to produce my film trailer, I thought it important to look into the typical target audience of horror films. I must ensure that I have a target audience in mind so that I know how to entertain that particular age range during my teaser trailer.
Firstly, I went onto the BBFC website and looked at the different certificates the body places on films. As I know the content of my teaser trailer will be of the horror genre, I decided to look closely at the certificates '15'  and '18.'
The BBFC deems any film certificate '15' if it includes any of the following:

• Strong violence
• Frequent strong language (e.g. swear words)
• Portrayals of sexual activity 
• Strong verbal references to sex
• Sexual nudity 
• Brief scenes of sexual violence or verbal references to sexual violence 
• Discriminatory language or behaviour 
• Drug taking 

I then decided to compare this to the certificate '18' to see if there is any difference and so I have a better idea of what certificate my film should be, according to the BBFC. The BFFC declares any film certificate '18' if it contains any of the following:

• Very strong violence
• Frequent or very strong language
• Scenes of sexual violence
• Strong horror
• Strong blood and gore
• Real sex
• Discriminatory language and behaviour