[MMM]

落ち着いた語気には、かつてのような若い鋭利さはない。

As a whole this sentence isn't so difficult, but the bold phrase 若い鋭利さ is a term I am not sure we use in English, at least in this way. "Youthful sharpness" is accurate, but is that really a phrase we would use?

(The narrator is seeing someone for the first time in a long time, and he has obviously matured over that interval. She makes that conclusion in the tone of his voice.)

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Oh, I was just reminded of one more, that might even get Nagoyankee...

目が堅い。