It's clear that Middle Ages is a term from the Renaissance. My question is:
What names did scholars use during the Middle Ages for their own period?
Well, of course Middle Ages is a single name for a very heterogeneous period that covers approx. 1000 years, so different periods of the Middle Ages might have different names and, of course, in the same period many names could have been used by different people, so every name is welcome and wanted.
edit: I know this is a broad question, but I don't think it's too broad. I don't want a comprehensive list, I'm just curious about any names you can remember :)