How do I change my iTunes ID? It is an old email, and therefore I can not update apps.
How do I change an old email address connected to my iTunes?
iPhone XR, iOS 12
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Please read this link -->
Change your Apple ID - https://support.apple.com/HT202667 - "Follow these steps to change the email address that you use as your Apple ID." Plus special instructions if your Apple ID ends with @icloud.com, @me.com, or @mac.com. You may also wish to turn off "Find My" before changing information and turn it on again afterward.
Please read this link -->
What to do after [or before] you change your Apple ID email address or password - "After you change your Apple ID email address or password, you might need to update your sign-in information with any Apple services you're using." Including "Find My" - Or if you're seeing persistent disabled messages or repeated requests for the password to your previous AppleID. - https://support.apple.com/HT204071