spring chicken

US /ˈsprɪŋ ˈtʃɪk.ɪn/
UK /ˈsprɪŋ ˈtʃɪk.ɪn/
"spring chicken" picture
1.

若者, 若い人

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.
彼女はもう若くないが、まだとても活動的だ。
At 70, he's certainly no spring chicken, but he still runs marathons.
70歳で、彼は確かに若くないが、まだマラソンを走っている。