I already have an Apple ID as a child but still can’t seem to download apps like my 10 year older brother

Hi damarrion82,

Welcome to the Apple Community.

Y

You might want to have a look at this article:

Click the Blue link below

and

Try following each step

(You may need to have a payment method on file,

even if what you want to download is free.)

If you can’t download or update apps on your iPhone or iPad.

https://support.apple.com/en-us/HT207165

Hope this helps :)