YouTube Insight, is a free video analytics tool for YouTube, that enables users to view “detailed statistics” about their videos. Google has added a new feature to insight called “demographics” tab, that displays view count information broken down by age group (such as ages 18-24), gender, or a combination of the two, to help you get a better understanding of the makeup of your YouTube audience. We show you general information about your viewers in anonymous and aggregate form, based on the birth date and gender information that users share with us when they create YouTube accounts. This means that individual users can't be personally identified.
Insight now also displays statistics based on the combined total views of all the videos you've uploaded. Just as you can explore the view counts and popularity of individual videos, with this feature you can see your account's total number of views, and your relative popularity on YouTube compared to other users, based on geographic location.