The Main Audience for a thriler

To try and find out the main audience for a thriller I looked at several thriller films of various types and compared them:
The Godfather, the main characteristics of this films audience (based on IMDb votes) were:

• males 
• people aged from under 18 to 29
• American's (more than any other country)

females also gave, on average, lower votes and there were significantly fewer female votes (around 260,000 less than male)

Die Hard, the main characteristics of this films audience (based on IMDb votes) were:

•  Males
• aged under 18 (Although they were fewer than males 18/21 they gave a higher rating overall. 
• Fairly evenly spaced between Americans and non Americans (possibly slightly towards the non Americans side)

Alien, the main characteristics of this films audience (based on IMDb votes) were:

• Males (beginning to see a theme developing)
• again although there were fewer males aged 18 and under they gave a higher rating than the 18/29 year olds.
• there were twice as many non Americans as Americans but you have to take into account that 'non Americans' applies to the rest of the world.