life-long

/L AY1 F L AO0 NG/
adjective
  1. 1

    Extending for the entire duration of life.

    โ€œThey were lifelong friends; they met in elementary school and ended their lives in the same rest home.โ€

Source: https://en.wiktionary.org/wiki/life-long, https://en.wiktionary.org/wiki/lifelong