noun
prime of one's working life; peak working years
Refers to the period in life when a person is most active and productive in their career, typically middle age. Often used in contexts discussing work, health, or social contributions.
彼は働き盛りに病気で倒れた。
He fell ill in the prime of his working life.
働き盛りの世代が社会を
The generation in their peak working years supports society.