Windows 7 Custom Property for Folders

What is the way to add a custom property for folders?

This is what I want to do:
I have moved all my DVD's to my media pc. I would like to have a custom field for each movie folder where I can add tags like "Young kids" "Older kids" "Family" "Parents" etc so that I can sort the folders by those properties in Explorer.

If there is a better way to do this, I appreciate your suggestions.

Thanks!