Unable to play EA games due to old account

only ea can unlink it, but there is another way to get in and unlink.

head over to https://www.ea.com/

click sign in then select the xbox logo and sign in with your xbox live account, here you can then unlink the ea account

for your information you cannot unlink ea from the microsoft side.

Hello, first it's a pleasure to be able to help you today.

My name is welcome to the community.

Hello Dea7hShadow64, by its description your brother does not have access to the Microsot account you use on Xbox, but if he knows the email can try to recover the account through the form below.

https://account.live.com/acsr

Help with the Microsoft account recovery form

https://support.microsoft.com/en-us/account-bil...

This is because only the account owner can link or unlink accesses from other developers.

EA uses their own service you log in with to access EA games. It uses that age to determine if you are old enough to play their games. Issues are common with children under 13 playing battlefield. Basically the answer is the same, you cant change the age
on the EA account. you need to make a new one there that's old enough and associate the new account with your gamertag.

Origin Accounts are the same as the old EA Accounts. If you already had an EA account then you just need to log into Origin (software, game,or website) with your old EA creditials. EA support might be able to merge accounts, they merged my old BF2 account
into my EA account a long while back.