Ability to not edit the PO's which are more than a year old

Summary

Ability to not edit the PO's which are more than a year old

Content

Hi All,

We have a requirement where in if the PO is older than a year, then user should not be allowed to edit the PO. Is there any standard way to achieve this. I know we have a functionality called :- "Close schedules in worksheet" which can use the inactivity period parameter but that brings all the PO's which are closed for Invoicing or closed for Invoicing. We would want only Open PO's which are not yet received or Invoiced to  either auto close or to not make it editable.