” There was a time when age used to matter for marketers. We would buy media based on presumed age ranges of audiences in the hopes that this bit of demographic information would help us reach the right people. In fact, this is one of the most time-honored traditions of marketing planning. It is also one of the dumbest. The thing about age is that it was always used as a proxy for interest. If you knew that someone was a male between the ages of 18-34, you could make a guess that they might like sports, or need deodorant, or drink beer. ”
Great blog post by Rohit Bhargava from Fastcompany.com.