spring chicken
US /ˈsprɪŋ ˈtʃɪk.ɪn/
UK /ˈsprɪŋ ˈtʃɪk.ɪn/

1.
小年輕, 年輕人
a young person, especially a young woman (often used in negative contexts to imply someone is no longer young)
:
•
She's no spring chicken, but she's still very active.
她不再是小年輕了,但她仍然非常活躍。
•
At 70, he's certainly no spring chicken, but he still runs marathons.
70歲了,他當然不再是小年輕了,但他仍然跑馬拉松。