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

1.
小年轻, 年轻人
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.
她不再是小年轻了,但她仍然非常活跃。
•
At 70, he's certainly no spring chicken, but he still runs marathons.
70岁了,他当然不再是小年轻了,但他仍然跑马拉松。