One's beard and eyebrows have both turned white, indicating old age.
这位老人一生为家乡奉献，如今已是须眉交白，但精神依然矍铄。
This old man dedicated his whole life to his hometown; now his beard and eyebrows have turned white, but his spirit remains vigorous.
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One's beard and eyebrows have both turned white, indicating old age.