The Age of Heroes vs. The Age of Superheroes

Canon In-Universe cause we humans like categorizing things.

The Age of Heroes

(Includes real people as well as those from myth, legend, fairy tales, classic literature, etc.)

• The Copper Age (pre-2100 BC. Not much is known about this period cause documented accounts are scarce, but the clues left by our ancestors that have managed to survive to the modern day suggest that they either witnessed or took part in some WILD STUFF! I'm talkin' Finno-Korean Hyperwar-type shit!)
• The Iron Age (2100 BC-1000 AD)
• The Palladium Age (1000 AD-1800)
• The Gallium Age (1800-1902)

The Age of Superheroes

(Includes pulp, comic books and anything from the last two centuries that's open source)

• The Platinum Age (1902-1940)
• The Golden Age (1940-1956)
• The Silver Age (1956-1985)
• The Bronze Age (1985-present)