彼は８歳だ。

彼は８歳だ。

He is eight.

彼(かれ)は８歳(さい)だ。

Kare wa hachi sai da.

彼 (かれ)

he; him; his; boyfriend

は (は)

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

八 (はち、や)

eight

歳 (さい)

-years-old; ability; gift; talent; aptitude; genius

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: サイ、セイ、とし、とせ、よわい

Meanings: year-end, age, occasion, opportunity