You can tell a great deal about the intended audience of a publication by the ads it carries. Advertisers target very narrow and specific audiences, so if the writing within the journal doesn't give away who it is intended for, the advertisers will. From looking closely at ads, you can often tell the following about the targeted audience:
Age
Occupation
Income Level
Gender
Morals/Ethics/Values
Leisure Time Activities
Politics
Most importantly, ads tell us what the audience of the publication values.
In Groups...