同輩

彼(かれ)は同輩に相当受けがよい。

He enjoys considerable standing among his peers.

彼(かれら)らは大人(おとな)になってからの同輩に受け入れられるだろう。

They will be accepted by their peers in adulthood.

一子ちゃんは同じ穴のムジナか、同輩の親しみを込めた笑みを俺(おれ)に向ける。

I guess Ichiko is a fellow rule-breaker, she's sending me a smile filled with affection for a comrade.