I don't have very deep knowledge about space-time, time dilation, etc., but I'll take a stab at it:
Time is a very human concept. For light, traveling at the speed of light, time simply doesn't happen (at least not "our" time, that is, the time which we perceive) because displacement in time is being completely converted into displacement in space (as in space-time).
If a spaceship was built that could go at the speed of light without destroying itself, its occupants could arrive at their destination, then turn around and come back to Earth, and no time would have passed.
Am I close to the mark or did I just totally miss something important?
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