Agreed, Peter, though some kind of terminology would be needed to encompass and describe the eras in question. 'Bronze Age' in non-comics history makes sense as it's in contrast with the Iron Age and the Stone Age, so we get a sense of what the prevailing level of technology was. Decades is clean but doesn't say anything at a glance about what actually was the flavor of the era, and gets increasingly complicated as time passes out of living memory.
It's such a tough thing, because it's almost impossible to do something like this without also having the name itself shade into commentary. Hence JB's concern with the current Golden/Silver/Bronze, etc.