Date Created is an automatic note metadata field, and searchable
It's easy to identify notes "ready to expire"
>>some special tags or something
We can create are own "special tags"; also searchable
Examples: ExpireWeek1, ExpireMonth1, ExpireYear1, ...
Search documentation at https://help.evernote.com/hc/en-us/articles/208313828
For example tag:ExpireYear1 -created:year-1