Research and Plannning: Target Audience

I am directing my magazine to target a specific type of audience. My audience would be age 16-19 generally, because I believe that this covers all of the age ranges of the students in college. I would generally aim this at the more intelligent students if it were to be free, however if I could sell each one for £1 each I would target the general population of the college in order to maximize profits. Again it would depend if either the magazine is priced or not but the cover lines would either be gossipy (but not slanderous), or more intuitive.