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white hair; grey hair; gray hair
最近白髪が増えてきたので気になります。
I've been getting more gray hair recently.
白髪を染めようかどうか迷っていますね。
I'm wondering whether to dye my gray hair.
父は四十代から白髪が目立ち始めた。
My father's gray hair started becoming noticeable in his forties.