For adult accounts (includes most people, in most regions)
- Sign in to Your info on the Microsoft account website.
- Select Edit date of birth.
- Change your birthdate, and select Save.
For child accounts, or parents changing a child's birthdate
If your child is above the statutory age (13 in most regions), they’ll need to sign in and update their birthdate using the steps for an adult account. If they're below that age, you can do it for them. Note: If their birthdate incorrectly shows them over the statutory age, they need to update it as if it's their correct age by using the steps above for an adult account.
- Using the parent's Microsoft account, sign in to your account on family.microsoft.com.
- At the bottom of the Your family page, select Manage my child's profile info.
- In the Manage permissions page of the child’s account that you want to change, at the right, select Edit this child's personal info and then follow the instructions.
For help with age verification, see Parental consent and Microsoft child accounts.