that concept of technological ages is kinda BS anyway
but for real, human history is like Mid Seier's Civilization and once a technology is unlocked it will now be used in every city forever until the next one is researched. and our stories should also be like this.
but for real, human history is like Mid Seier's Civilization and once a technology is unlocked it will now be used in every city forever until the next one is researched. and our stories should also be like this.