Targeting a specific audience;

A target market is a group of customers that the business has decided to aim its marketing efforts and ultimately its merchandise.
"How can we study audiences without relying at one extreme on personal anecdotes or, at the other, on masses of indigestible figures?" (Hart 1991, 30) http://www.aber.ac.uk/media/Students/pph9701.html
I picked this quote, ever since it shows that everyone has their individual identity and that we cannot physically 'study' one particular age group, because they're all have different personalities and outlooks. However, what is possible is the fact that a certain age group should be studying between the years 5-16, in both primary and secondary schools. Thus, we could portray this by setting up a scene within a school with students in their uniform. Therefore, this would target a specific audience, because it would not appeal to older age group as their are not in education. Although, older individuals could have an interest in this program, because they do teaching.
In addition, my research shows that targeting a specific audience is nearly impossible, because everyone has dissimilar point of view. However, as I explained above, it illustrates that there are many subjects that are only aimed at a specific audience. For instance: a diet programme for men with heart disease problems that would obviously would be targeted at men. However as women are more concerned and caring this could be targetted at them who would take a good care of the nutrition plan for her husband.