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A circular motion is complicated (where does the "time dialatation" come from, centripetal acceleration or relative motion?)That's time dilation without any differential ageing.

Let's stick with translational motion. Each of the twins is at the center of a long synchronized clock line. As the twins move past each other, they set the clocks directly in front of them - and thus their entire row of clocks - to "zero". The twin's clock continues to move past the other twin's row of clocks. Comparing the display of his clock with the display of the meeting clock, the twin notices that the display of his clock is lagging more and more behind the display of the just passing meeting clock. This is a symmetric process. Neither twin ages faster or slower as a result.

"It's time dilation without differential aging."

So what is the effect of the twin parodoxon? The acceleration of one twin!