birthdate was entered incorrectly

Change the birthdate from your Microsoft account profile; if the incorrect date makes the account appear underage, an adult Microsoft account must provide consent and edit it instead.

If the birthdate field is editable

1. Open the Microsoft account profile.
2. Sign in with the Outlook.com account you need to correct.
3. Change the Date of birth.
4. Select Save. ^1^

If Microsoft considers the account a child account

If you see “Parent or guardian consent is required for this account”, or the birthdate cannot be edited:

1. Sign in at login.live.com with the affected account to start the consent request.
2. Select I’m a parent or guardian.
3. Sign in with another adult personal Microsoft account. If necessary, create one from the sign-in/sign-up screen.
4. Select Yes, I agree on the consent form.
5. Select Family Safety to finish.
6. Using that same adult account, open Manage child accounts.
7. Find the affected account and select Edit this child’s personal info.
8. Enter the correct birthdate and save it. ^1^

If consent had already been granted, skip the new consent request: sign in to Manage child accounts with the adult account that originally provided consent, then select Edit this child’s personal info.

If the account is not listed, the signed-in adult does not have permission to edit it—consent may have been provided through another adult Microsoft account. ^2^

References

1. How to change a birth date on a Microsoft account | Microsoft Support
2. Managing parental consent | Microsoft Support