How do I change my Date of birth on Apple Account?
When I got my phone set up my mom put my younger sisters birthday in instead of mine which is 2,25,2010
[Re-Titled by Moderator]
iPhone 13 Pro Max, iOS 18
Question marked as
See Update the birth date associated with your Apple Account - Apple Support for the action to take to change the DOB.
If the DOB you mentioned in your question is yours, rather than your younger sister's who is not yet 13, read the section of this support document called About changing a birth date for a child