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Jyutping bou2 dou1 mei6 lou5
Pinyin bǎo dāo wèi lǎo

Definitions (CC-CEDICT)
  1. treasure knife does not age (idiom); old but still vigorous
Definitions (粵典–words.hk)
  1. 語句
    人​嘅​精神​或​技能​冇​因為​年​紀大而​衰退
    old but still vigorous in mind and body (of a person); literally: the precious sword does not age
    • 阿伯寶刀未老,朝朝去晨運。
      阿伯宝刀未老,朝朝去晨运。
      aa3 baak3 bou2 dou1 mei6 lou5, ziu1 ziu1 heoi3 san4 wan6.
      The old man, still energetic, does exercise every morning.
Definitions (Wiktionary)
  1. phrase, idiomatic
    old but still got it; as vigorous and active as before; just as skilled as when one was young
    (syn.) 寶刀不老, 宝刀不老
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    宝刀未老
    寶刀未老
    bou2 dou1 mei6 lou5
    • old but still sharp
  2. Cantonese
    阿伯宝刀未老,朝朝去晨运。
    阿伯寶刀未老,朝朝去晨運。
    aa3 baak3 bou2 dou1 mei6 lou5, ziu1 ziu1 heoi3 san4 wan6.
    • The old man, still energetic, does exercise every morning.