relative motion and aging



Is it true that relativity predicts that, for example in the twin
paradox, one twin is younger than the other when re-united?
Is it true that in any general case, if one twin moves faster than the
other, it predicts that they will be aged differently?
Is it also true that relativity applies in this way to any two bodies
moving wrt each other? No matter which body you pick as the 'at rest'
body?
If so, does relativity predict that both bodies will be younger than
each other, depending on which you view as moving wrt to the other?

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Relevant Pages

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