Old accounts
The email address used for my old old account is not longer activated. How do I delete my old apple account with the old email.
You can delete the account or try doing a name change on the account.
All purchases made using an Apple ID are tied to the ID. Delete the ID and you will need to download them using your new ID. Make sure you sign out from the places in the 4th link before deleting the ID.
How to delete your Apple ID account
What to do after you change your Apple ID or password - Apple Support
Note the restrictions in the article.
What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.