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ok, here's my spin on it,
travelling at the near the speed of light and even higher in the earths gravity will mean that time will "tick" away at a different rate. This has been proven scietifically by flying an atomic clock up up in a plane and then comparing it to a synchronized gound based one.
So, on the trip out to the stars at a CONSTANT speed, time will be different for the astronauts that the earth based guys. I can't remember who will be older though.
Now the problem is that special relativity does not allow for acceleration, and so the problem happens when you get to the star and decelerate to turn around and then accelarate to come back. This from memory is where all the comparative aging occurs
I will grab my special relativity book and quote from it tonight
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