I am retiring this year and want to know how to close my Company Adobe Account permanently as it will be attached to a non-existent email address
IF you have a creative cloud individual subscription you can simply refer to Manage your Adobe Creative Cloud membership
In case you have a team subscription and you want to cancel it then you would need to contact Adobe customer care for cancellation. Also if you want to handover the team subscription to a different person that can be achieved as well.
For direct Creative cloud team subscription you can refer to Manage your Adobe Creative Cloud for teams membership. for admin change
If you purchased it through Adobe re seller then you will need contact Adobe customer care at Contact Customer Care for admin change