Device Inventory purge old devices

Hi

Does anyone know if or how it's possible to set a purge interval on 5.4.3 for old devices? We often have the case that old not available anymore devices show up in the logs with their IP address which are used already from another device since a while. So if it would be possible to set a value to delete old devices not seen anymore for X days we could eliminate such devices without having them manually to delete from the Inventory list.

Thx