知命之年 [－－－－]

Jyutping zi1 ming6 zi1 nin4
Pinyin zhī mìng zhī nián

Definitions (CC-CANTO)
  1. (noun) quinquagenarian; 50 years old
Definitions (Wiktionary)
  1. phrase, idiomatic
    50 years old; to be a quinquagenarian