Is there any way to change my account from "child" to "adult"?

Hi and thanks for reaching Microsoft Xbox gamer's community.
My name is Josef.
I'm an Independent Advisor

Hope you're doing great today despite this FAIRYTHEBERRY

Please tell me:

How old are you?
The age in your Microsoft account is the same as your real age?
And, are you part of a family group?
Double check this here
https://account.microsoft.com/profile
And here
https://account.microsoft.com/family/home

Thank you
No need to share your real age, sorry if I wasn’t clear

Okay, as you’re part of a family group please ask to the family organizer (if it’s your brother to him)
To remove you from the group, once removed ask him to re-add your account but as family organizer
Not member

Once they add you check if you’re finally an adult

Hello,

I'm over 18 (I'm not comfortable sharing my real age but just know I've already graduated college), yes the account has my correct age and date, and yes I'm part of the family group. My younger brother's account being the "adult", account like mentioned previously.

Can i change the status of my account from adult to child? And create a new adult account?

There is currently no way to do that. Sorry.

There is not a way to change your child's account from child to adult until the age of the account is 18. What specific settings are you trying to change?