Delete files modified before another file

I play Civilization a lot. When I start a new game I want all earlier save files to be deleted.
The test is "if file mod date is older than mod date of [AutoSave_Initial_0000 BC-4000.Civ5Save]" but I cannot figure out if this is possible to do in Hazel.
The test is "if file mod date is older than mod date of [AutoSave_Initial_0000 BC-4000.Civ5Save]" but I cannot figure out if this is possible to do in Hazel.