What kinds of people watch music videos?

There are various types of people who watch music videos, as well as various reasons why they watch them. For the majority of people who watch music videos, many would be fans of the musician and would watch the music video to support the artist. Additionally music videos are obviously made after songs, and thus many people who watch them, may simply watch them because they like the song rather than like the artist. Additionally some people may enjoy the visual aspect of the music video despite not liking the song. This all accumulates into views and popularity.

 It's also more likely for viewers of music videos to be younger, as a majority of music videos are most likely online and younger people are more likely to be tech savvy due to being raised around technology. It's also more likely for younger people to be fans of popular artists, which can be supported by the fact that the second most popular music video on youtube is 'Justin Bieber - Baby' which has 936,117,346 as of 24/11/13. Justin Bieber's fans age demographic can be seen: 

It also seems to be more girls who watch music videos, which can be supported by the fact that the 10 most viewed music videos feature artists such as PSY, Jennifer Lopez, Justin Bieber, Lady Gaga etc etc:

Justin Bieber's gender demographic

and Lady Gaga's:

Lady Gaga's gender demographic

 In conclusion we can assume heavily that girls aged 13-18 watch music videos.