The best way to target a market is by reaching them.
I found this picture a perfect example of mass marketing to all age groups, which is a good strategy if you are looking to maximize sales. Yerevan magazine focuses on Armenian news, culture, history and lifestyle, something that would be interesting to different generations. In a case study during class we covered a magazine that targeted only young moms, very specific target. Failed with the research part, the magazine did not meet their quotas simply because the target market was too small. Having a backup is always a better way to go.