in their middle twenties
二十五六岁
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The volunteers made up three age groups: young people in their twenties, middle-aged people in their forties, and older people in their sixties.
自愿者分为三个年龄组：20多岁的年轻人群，40多岁的中年人群和60多岁的老年人。
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