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Ok lets be simple.
You somehow can travel at the speed of light. You get in your spiffy machine and zoom out into space at the speed of light.
You travel for 4 light years, flip a u turn and zoom back to earth.
You land your spiffy machine, get out and you will only be 8 years older, but the rest of the people on the planet would have aged a whole lot more.
You suddenly relize yes 8 years have past for you but for the rest of the planet it is not so. That places you where? Oh yeah in the future.
Edited- forgot to double the years for the return trip.
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