As an FYI FoE has been deleting worlds of inactive players. There are some parameters like city age and diamonds in the account that can prevent deletion but here's what we suggest as this will mostly affect people who have little to no diamonds in their account and have secondary or diamond worlds that they don't visit.
If secondary worlds have not reached High Middle Ages they can be deleted after 30 days of inactivity.
People with Iron Age diamond farms should be aware of this.