Explanation of Target Audience

I believe that the appropriate target audience for my magazine should be between the ages of 15-30. I know from personal experience that people in their late teens; as well as adults, enjoy the rock/alternative genre of music. Taking this into account, I belive it is apt for me to model my music magazine around this target audience, encapturing a sense of youth into the music magazine- but also a sense of maturity (to cater for the older readers). The reason why I decided on 15 years rather than early teens (12-13) is that I believe that the conventional 12-13 year old in society today; would not be as into rock/alternative music as the older teen would be. Also (as some rock music is controversial at times), it is more appropriate to increase the lowest range of the target audience to an older teenager rather than children entering their adolesence.