My favorite fandom (the TU) spans roughly 200 years. One of the other writers on the Trinity Storytellers Handbook is including, in his chapter, an alternative campaign setting in which Trinity's psions appear in the early 21st century instead of the early 22nd, taking the place of Aberrant's novas (of which latter md_donighal is one).

Can it be only about fifty years earlier? Because I've long wanted to write a campaign frame in which the Inspiration Age of Adventure! (the 1920s game), instead of ending in the forties, segues into an early Nova Age.