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You have the twin paradox reversed. The guy who left travelling at high speed would come back to find everyone he knew long gone. This sort of "traveling forward" in time has actually been measured, and correcting for it is required for GPS satellites to work correctly. The satellites move fast enough for the clocks to desynchronize with those on earth very quickly. Actually with GPS, their speed accounts for only about half of the discrepancy. The rest is from the the earth's gravitational field being weaker up there (that also changes the rate of time flow).
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