I am trying to setup an OSGi config for workflow purge activities as mentioned in
How do I setup the OSGi configuration such that it purges workflow instances which are in completed state for more than 60 days. workflow.older-than property does not seem to work like that but it takes specific date as input.
If you are looking for purge based on days old, you can make use of OOB Workflow Purge
Tools -> Operations -> Maintenance -> Weekly Maintenance window -> Workflow Purge -> Configure