Windows 10: Change my DOB in my account

Microsoft have my WRONG DOB in my account I have tried 3 months in all ways but they do not know how to correct it ....they say it is 2016 a child when it should be 1943 I am 80

:)

 

Change DOB on account

for some unknown reason recently the DOB on my account has changed and now puts me at 13 years old, this is causing issues accessing my emails

 

Can't change Microsoft Account DOB using neither method recommended my Microsoft

I want to correct my wife's DOB from 2015 on her Microsoft Account to prevent any restrictions for her using her laptop applications.

I have followed the instructions of:

https://support.microsoft.com/en-gb/help/12411/microsoft-account-change-birthdate

The first method doesn't work because it thinks she is a child so I have to resort to the second method of adding her to my account as a family member.

However, on the family account list, it states her account as an adult. It won't let me modify the dob.

Questions:

1 - How can I correct her DOB if I can't do it through her account or through my family account.

2 - Why does on the 'your family' list on my account say she is an adult when her dob is currently set to 2015.

Thank you...