Nintendo Children's Account to Normal Account?

I got Nintendo Switch Online last year but my account is still a kids account and I would like to change that (if that works) I also had to get Nintendo Switch Online through my sister's account. And I do not want to create a new account because log out of the account at the Nintendo Switch etc. Is that because the data is lost.

First of all to delete accounts

https://www.nintendo.de/...78978.html

To your question I have found nothing, maybe call / email support

Found that, your problem only the other way around

Spoiler: does not work

https://www.nintendo.de/...77563.html

Your account will be "normal" as soon as the set date of birth creates the 18th year of life.

Thanks a lot to you two!

Please, they're both mine.

Oh ok thanks xD