知命之年

zhīmìngzhīnián

50 years old; to be a quinquagenarian

Wiktionary

Entry Composition

1 知命 zhīmìng
  1. (literary) to understand the Decree of Heaven; to know destiny
  2. (literary, idiomatic) age of fifty
  3. age of fifty
  4. to understand the Decree of Heaven; to know destiny
2 之 zhī
  1. (possessive particle, literary equivalent of 的 de)
  2. him
  3. her
  4. it
=3 年 Nián surname Nian
=3 年 nián year

classifier: 個
=3 年 nián
  1. grain
  2. harvest (old)
  3. variant of 年 nián