Sharing this in case it helps anyone else.
If you use #Apple Wallet or #ApplePay, you may want to make sure your billing and shipping addresses are up to date.
If the billing addresses aren't right, you could get payments declined. If the shipping addresses aren't right, you might accidentally make an online purchase, only to have it shipped to somewhere you no longer receive mail…
Unfortunately, the UI is *super messy* and not intuitive. There is not a single place where you can "manage my addresses" with Apple. 
Please see this forum thread with the comprehensive list of SEVEN PLACES you have to check and update your addresses if you want everything to be consistent across your devices.
The good news is now my devices no longer show my addresses from 10+ years ago.
https://discussions.apple.com/thread/252502493?sortBy=rank