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на три года моложе

three years younger

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phrase Rare #39,979
three years younger Used to state an age difference; моложе is followed by the person being compared, usually in the genitive case.
RU: Моя сестра на три года моложе меня.
EN: My sister is three years younger than me.

Я на три года моложе его.

I am three years younger than him.

Он на три года моложе меня.

He is three years younger than me.

Подружка Тома на три года моложе его.

Tom's girlfriend is three years younger than him.

Ты на три года моложе Тома.

You are three years younger than Tom.

Том на три года моложе меня.

Tom is three years younger than me.