If you've found that your birthdate is incorrect on Facebook, you should correct it for security purposes. See this FAQ to find out two ways to do so.
How to modify your date of birth from your account?
- Log in to your account and click on your profile picture in the top right.
- Your profile page will open. Select About. You can find this section under your name.
- Next, click Contact and Basic info.
- Scroll down to Basic Info and click on the pencil icon next to your birthday.
- You can now choose the date of birth.
- Click on the checkbox and then select Save.
How to modify your date of birth from the Help Center?
For this second option, you will have to fill an official request in the Help Center. Once you follow this link, you have to choose a reason for your request.
Confirm by selecting Save.