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Jyutping baak6 tau4 gaai1 lou5
Pinyin bái tóu xié lǎo

Definitions (CC-CEDICT)
  1. (to live together until the) white hairs of old age (idiom); to live to a ripe old age in conjugal bliss
  2. until death do us part
Definitions (粵典–words.hk)
  1. 語句
    祝賀語​。​指結婚​之後維持​婚姻​直至​夫妻​都​滿頭​白​髮
    literally to remain married until the hair of the husband and wife becomes grey; remain happily married until husband and wife are both very old
    • 祝你兩個新婚快樂,白頭到老。
      祝你两个新婚快乐,白头到老。
      zuk1 nei5 loeng5 go3 san1 fan1 faai3 lok6, baak6 tau4 dou3 lou5.
      May you two have a happy wedding and remain happily married until you are both very old.
  2. 參看
    白頭到老
Definitions (Wiktionary)
  1. phrase, idiomatic, said of a couple
    to live together until the white hairs of old age; to live to a ripe old age in conjugal bliss until death do us part; to remain happily married to a ripe old age
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)