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1) Yes, but never more than a dozen or so at a time.

2) You may be thinking of the effects of relativity. If you were to travel through space at velocities near the speed of light, the theory of relativity suggests that you would subjectively experience the passage of time differently than everyone else, who sensibly stayed behind on Earth.

Thus, you might travel for (let's say) 50 years in your perception (in a tin can? boring!) and return to find that (let's say) 500 years had passed on earth, everyone you know is dead, you yourself are at best a nearly-forgotten legend from another age, and Morlocks (or perhaps damn dirty apes) are now running the planet.

For these reasons, it is not recommended to travel near the speed of light for any great length of time. Don't say I didn't warn you.

3) Microgravity environments are difficult and stressful for the human organism, which evolved to function in 1g environments. So far, human space vehicles and stations are poorly shielded against cosmic and solar radiation. At our present level of technology, living in space can only be seen as a stressful and risky proposition. It would be fair to say that you would "age" much faster due to the rigors of space travel than you would taking it easy at home.

If in the future space travel technologies somehow improve to the point where radiation, gravity, and other physical conditions mirror those on Earth more or less perfectly, I would assume people would age at the same rate there as here.

if you were stationary yes if you orbit the speed of light your perception of time would change but you'll still age

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