彼らは同い年だ。

彼らは同い年だ。

They are the same age.

彼(かれ)らは同(おな)い年(どし)だ。

Karera wa onaidoshi da.

彼ら (かれら)

they (usually male); them

は (は)

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

同い年 (おないどし)

the same age

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、おな.じ

Meanings: same, agree, equal

Readings: ネン、とし

Meanings: year, counter for years