Facebook gives you options when it comes to displaying your birthday. You can elect to share only the month and day you were born, or also include the year. When your birthday rolls around, it shows up in the top right corner of your friends' homepages. While you cannot disable the alerts of your friends, you can control whether or not your friends are notified of your birthday. Make your birthday only visible to yourself to stop friends from getting an alert.
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Click on the "Account" icon in the top right corner of any Facebook screen.
Select "Privacy Settings" from the list that appears. Click on the blue "Customize Settings" link at the bottom of the "Sharing on Facebook" section.
Scroll down to the "Birthday" line in the "Things I Share" section.
Click on the grey icon next to "Birthday" that displays the current privacy setting -- by default, it is set to "Everyone." Choose "Customize" from the drop-down menu.
Click on the downward arrow in the "Make This Visible to These People" line to bring up a menu. Select "Only Me" and then "Save Setting."