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Jyutping cing1 ceon1 bat1 zoi3
Pinyin qīng chūn bù zài

Definitions (CC-CEDICT)
  1. lit. one's youth will never return
  2. to make the most of one's opportunities (idiom)
Examples (Wiktionary)
  1. Mandarin
    青春不再
    青春不再
    qīng chūn bù zài
    • One’s youth never returns.
  2. Mandarin
    当青春不再
    當青春不再
    dāng qīng chūn bù zài
    • when we are no longer young