prime, height
でも私には聞こえる失われた男たちの声が青春の盛りに―彼らは姿を消した
But I can hear the voices of the lost men in the prime of their youth—they have vanished.
— 海の上のピアニスト (1998)
彼女は今が青春の盛りだ。
She's in the prime of her youth.
どんな人でも盛りの時はある。
Everyone has a time when they’re at their best.
息子たちは若い盛りだ。
My sons are in the prime of their youth.
彼女は今が若い盛りだ。
彼はいまを盛りにと言う時に倒れた。
He collapsed just when he was at the height of his powers.