天荒地老

tiānhuāngdìlǎo
(idiom) until the end of time

CEDICT

end of time; all eternity

Wiktionary

比喻時代的久遠。唐．李賀〈致酒行〉：「吾聞馬周昔作新豐客，天荒地老無人識。」《二刻拍案驚奇．卷六》：「蓋謂世間惟有願得成雙的，隨你天荒地老，此情到底不泯也。」也作「地老天荒」。

重編國語辭典

Entry Composition

1 天 tiān
  1. day
  2. sky
  3. heaven
2 荒地 huāngdì
  1. wasteland
  2. uncultivated land
3 老 lǎo
  1. prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity
  2. old (of people)
  3. venerable (person)
  4. experienced
  5. of long standing
  6. always
  7. all the time
  8. of the past
  9. very
  10. outdated
  11. (of meat etc) tough