I put the wrong Date of Birth on my Minecraft Account.

There is nothing that can be done once an accounts date of birth is put in on an account that is the date of birth of the account and can not be changed.

i play on PC. I was added as a child because my birth date was wrong but i could change my birth date to the right one. I left the family account now im the organizer.

You don't. Once your account is created, the date of birth you put on it is the date of birth you are stuck with.

Split from
this thread.

Can you never change the birthdate on the account???? Even if you accidentally put in the wrong date of birth???

So....If I accidentally created the account for a 10 year old, but the person is actually 20....do I/they have to create an entirely new account with the correct birthdate bacause it can never be changed????

Yes they will have to create an entirely new Xbox account if they want to have the correct date of birth.

What @{Parity} posted wont help unfortunately. That only changes the date of birth on the Microsoft Account and has no affect on the Xbox accounts date of birth. The date of birth that is entered when the Xbox account
is first created is set in stone and cannot be changed.

Sorry this happened... Question, did you check the date of birth listed on your account? Because if it was entered wrong this date cannot be changed. If you entered an incorrect date of birth when you created the account, your only option is to create a
new account using the correct date of birth.