You may need your birthday when you want to try to use password recovery steps on Yahoo. And for a reason that might we don’t understand, in the day you created yahoo account, you just filled in the birthday date whatever you want (not your real birthday) and then you got forgotten! That is way you want to change your birthday and ask How could I change Birthday on Yahoo?
Unfortunately the answer is: You can’t. For security reason (password recovery reason) you birthday would never be able to change, even you can’t see in your profile. The only way to view your birthday is Remembering it in your brain! So, be wise when you try to create a yahoo account and always remember in you thought about your birthday, it’s like a password for you.
Stop searching right now about this issued of changing your birthday cause it’s useless!.