The user had a YouTube account/page 6 or so years ago. This page shows up when their name is searched, and they want to work on it again. They have forgotten which of their several old email accounts they used. (They tried several) The URL shows a user name (Partial sample here)
How can they get the email address of this account, and regain control?
I've tried the YouTube help, but it keeps sending us to help pages that ask for the email address as verification.