Xbox Gold can't be bought

What do I or my parents have to do? It is not there!

Where do you buy membership? In the Microsoft Store or by key at a third party dealer?

Ouh, somebody has given his real age on the Microsoft account.

Your parents have to do this through their Microsoftacc. Make or give you permission

No in the store in the Xbox app

My parents created an account years ago when I got my 360.

So in the Microsoft Store. Then your account needs to be verified.

Is called?

And then apparently a block for transactions in the store was set up. As I said, your parents will likely have to log in with their details and allow you to do so

Yes but where on which website?

Either you convert your child account to a normal one or your parents approve the purchase with the PIN.

Yes, but it says that they can't approve it

Your parents have to log into the Microsoft Store & then release the linked child account there.

Ok, I could change my age… I still can't buy it…

The official Microsoft website

I also dare to strongly doubt that changing one's age will bring any direct benefits. Otherwise it would be pointless. Confirmation via the parent's account will also be required.

I also dare to strongly doubt that simply changing your age will simply release the account.

I can remove myself from the family "and security settings are no longer applied" does that bring anything?

Sounds like you're setting up the account yourself. So it's worth a try. Why don't you just buy membership with a key? Is cheaper than in the MC Store.

I've only ever had the same error… On 360 I can redeem it but everything is "converted" into money for whatever reason, so gamepass is worth 10 euro or something similar

Worked…

The best thing to do is to simply create a new account.

Exactly… But there are my successes, bought games, etc. In it!

You don't lose your old account because of that, you just have two.