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Jyutping faan2 lou5 waan4 tung4
Pinyin fǎn lǎo huán tóng

Definitions (CC-CEDICT)
  1. to recover one's youthful vigor
  2. to feel rejuvenated (idiom)
Definitions (粵典–words.hk)
  1. 動詞
    用​嚟​形容​老人家​好似​後​生仔​咁​有​活力
    rejuvenated; vital, as if one has become young again
Definitions (Wiktionary)
  1. phrase, idiomatic
    to recover one's youthful vigour; to become young again; to become rejuvenated in one's old age
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    无人可以返老还童。
    無人可以返老還童。
    wú rén kě yǐ fǎn lǎo huán tóng 。
    • You'll never be young again.
Examples (粵典–words.hk)
  1. Cantonese
    冇人可以战胜时间,返老还童。
    冇人可以戰勝時間,返老還童。
    mou5 jan4 ho2 ji5 zin3 sing3 si4 gaan3, faan2 lou5 waan4 tung4.
    • Before time, we are all losers, unable to return to our very young age when we grow up.