Hi Yusuke, this is a great question!
Both are grammatically correct and make sense. To me, "3 years later" just sounds better in your sentence.
Sorry that my answer couldn't be better!
April 22, 2020
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I guess native speaker would like to say " 3 years later" .kinda like a habit.
April 22, 2020
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I got married at the age of 25, after 3 years(3 years later), I got divorced.
April 22, 2020
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context?
April 22, 2020
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