While Space-man lives for 1 day, then how long does Earth-man live ? 1000 years or 1 second? [duplicate]

Acordding to Einstein's Relativity, while Space-man lives for 1 day(just a number for example , not an exact number calculated from the corresponding relative speed), Earth-man can live for 1000 years (just an example number too). But from the view of Space-man, while Space-man lives for 1 day, Earth-man lives for 1 second. So while Space-man lives for 1 day, then how long does Earth-man live ? 1000 years or 1 second? Or 1000 years = 1 second actully ?！

• As long as the two never meet again, that question has no answer. Only if they meet again, their age can be meaningfully compared. – celtschk Apr 27 '14 at 8:48
• The "Twin Paradox" is not a paradox at all. You have to decide which person has experienced acceleration - usually spaceman. The one who experience acceleration is the one whose clock runs slower in the space-man Earth-man frame (they have to start at the same place or it is meaningless). The acceleration is easy to measure, so they know which one has the slower clock all the time. – C. Towne Springer Apr 27 '14 at 8:50
• @C.TowneSpringer: From Wikipedia: "A paradox is a statement that apparently contradicts itself and yet might be true." The twin paradox fits that description quite nicely. More exactly, the twin paradox is a veridical paradox, a claim that actually is true, despite the apparent contradiction. – celtschk Apr 27 '14 at 9:06
• @celtschk The Twin Paradox usually has "One twin takes off in a rocket...". At that point, no contradiction and no might be, and no paradox. The statement made by the OP is more of a of a para-problem and I assumed a lot was left out in order to make sense of it. – C. Towne Springer Apr 27 '14 at 13:59
• @C.TowneSpringer: Of course no true contradiction (otherwise it would not be a veridical paradox). But an apparent contradiction (because at first view the situation looks symmetric, until you think about it). If there were no apparent contradiction, it would not be asked so often. – celtschk Apr 27 '14 at 14:03