How can a twin on Earth grow old slower than his/her twin sibling?

I understand it might happen in a weak gravitational field. If I have twins on Earth, but one of them suddenly gets transported to intergalactic medium (without any great mass nearby), then the transported twin would grow old faster and would get back to Earth as an older person (Tell me if I'm wrong, please).

But are there any other ways (scientifically speaking) that a twin on Earth would stay younger than a twin that have "gone elsewhere"?

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How can a twin on Earth grow old slower than his/her twin sibling?

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