Targeting and how it works:
Age
Yahoo! User provides their date of birth upon registration. Ads are then served to logged in users that match the age range specified.
Gender
Yahoo! User provide their gender upon registration. Ads are then served to logged in users that have identified themselves as the specified gender.
Country
The ad server determines the users geographic location based on their Internet Connection (IP targeting).
Day of Week
The calendar in the adserver identifies the day of the week. Ads with day of week targeting are held until the specified days.
Time of Day
The time is identified by the adserver based off a 24 hour clock. Ads with time targeting are held until the specified times.