Gurkenglas comments on Open thread, August 4 - 10, 2014 - Less Wrong Discussion
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Your first statement is still correct.
To be more explicit: What is needed to make the statement interestingly wrong is for the two 20-year figures to be in different reference frames. If your twin does something for 20 years, then they will be 20 years older; but if they do something for what you experience as 20 years they may not be.
Rephrased to more explicitly place "for 20 years" in the earth's reference frame.