彼は働き盛りだ。

彼は働き盛りだ。

He is in the prime of life.

彼(かれ)は働(はたら)き盛(ざか)りだ。

Kare wa hatarakizakari da.

彼 (かれ)

he; him; his; boyfriend

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: ドウ、リュク、リキ、ロク、リョク、はたら.く

Meanings: work, (kokuji)

Readings: セイ、ジョウ、も.る、さか.る、さか.ん

Meanings: boom, prosper, copulate