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Hi,
The twin paradox occurrs at speeds far less than C. It would take an infinite amount of energy to reach C so this is clearly impossible. However speeds less than C would certainly be achievable. In fact future astronauts would use the twin paradox to make interstellar travel possible. At 0.5C the time dilation factor is 0.86, the closer one gets to the speed of light the higher the time dilation factor. At 0.999C the time dilation factor is around 6. This means that the trip to alpha centauri would from the astronauts view only take a few months elapsed time.
I think in the future humans will easily be able to get to speeds up to 0.999999999999C which would give time dilation factors of a few thousand and allow for trips clear accross the galaxy in only a few days astronaut time.
Cheers
Paul
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