Brain fade !

[Wristpin]

it would seem that when I set up my Apple ID I entered an incorrect date of birth!
How can I correct this?

 

[J. A.41]

Go to this site:
https://appleid.apple.com/account/home

Select "Manage Apple ID", login with your Apple ID and go to "Password and Security".

Answer your security questions. That done, you'll find a page with your security questions, the rescue email address and your birthday date. Change the date and save the entry.