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Source: https://writers.stackexchange.com/a/41583
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

First of all, if your story is set 100 years in future, with all relevant technological advancements in place, you would want to make it all clear from the very beginning. You don't wont to create a "today" image like TV Tropes' "[Next Sunday A.D.](https://tvtropes.org/pmwiki/pmwiki.php/Main/NextSundayAD)" and then suddenly say "Let's go on interstellar trip!" Thus, discrepancies with today's world are unavoidable. What you can do is limit how much of the futuristic details are shown to the reader.

Those futuristic details can be classified as "plot-relevant" and "world-(or mood-) relevant". For example, the mode of transportation used by everyday people (flying cars, teleportation etc.) is likely plot-relevant as it can set expectations regarding what is possible in this world and what to expect in space combat.

Other details (like flooded New York in [A.I. Artificial Intelligence](https://en.wikipedia.org/wiki/A.I._Artificial_Intelligence)) may be not really plot-relevant, but provide the look and feel of a futuristic world. You may want to have some "world-relevant" details as well, even if you are writing a story about a boy next door. His day-to-day life may be not very different from ours, but the big world out there should be very different. Have the reader prepared! Or you may want to choose to discover the world as story goes - your boy had never left his small town before, and then he suddenly catapulted on a space-bound adventure. Have the reader amazed!

Original score: 5