How to Delete Your Date of Birth on Facebook
Facebook is an online social network, similar to MySpace or Twitter, that allows people around the world to communicate with each other and find new friends. Many features and applications are available for all of the user accounts, and you can display as much information on your profile as you want. It's easy to change how your user page looks by editing the info you want to show on your profile, including your date of birth.
Go to facebook.com and log in with your user name and password; then press "Enter."
Click on the "Profile" option on top of the page.
Click on the "Info" tab under the status line and then click the "Edit Information" link.
Click on the drop-down menu under the birthday date and select "Don't show my birthday in my profile."
Click the "Save Changes" button and then "Done Editing" to delete your date of birth from your Facebook profile.