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より三歳年上

three years older than

→ より
phrase Rare #37,073
three years older than Used to compare ages. より marks the person being compared with, 三歳 means three years, and 年上 means older.
JA: 姉は私より三歳年上です。
EN: My older sister is three years older than me.

彼は彼女より三歳年上です。

He is three years older than her.

彼女は私より三歳年上だ。

She is three years older than me.

彼女は彼より三歳年上です。

She is three years older than he is.

彼は私より三歳年上だ。

He is three years older than me.