Sales order auto deletion after 7 days of delivery

Dear Team I wanted that the sales order will be deleted automatically after 7 days of delivery order creation. Plz help.

Dear Team,

Please reply…

Deletion is going to be difficult since there are other documents referencing to the document(SO)
You can use filters and remove it from your List view

can it be done by coding?

No it is a validation issue, cannot be solved with Coding