YouTube has a tool called Insight that lets you find out aggregate information about your viewers.
To use Insight, log into YouTube and click on one of your videos. On the right-hand side of the window, click on the button labeled Insight.
Insight has several tabs to let you find different types of information:
- Views: This shows approximately how many people view your video. It's broken down by day and country.
- Popularity: This compares your views against all other videos. It's also broken down by day and country.
- Discovery: This tells you how other people find your video. Do they wander in from related videos or are they finding it in search?
- Demographics: This tells you what the age range and gender of viewers.
- Hot Spots: This compares your video to other videos of the same length and tells you which spots lose and gain viewers. High points in a video may indicate that viewers are rewinding to play a section over again, and low points indicate viewers stop watching at that point relative to other videos.
Keep in mind that all this data is an approximation. If your viewers are mostly viewing your videos embedded on blogs or Web pages, it's probably not going to be as accurate as it would be if they're logging into their YouTube account to watch.