幼馴染(おさななじ)みchildhood friend, friend from infancy, old playmate

私(わたし)と彼(かれ)は幼馴染(おさななじみ)で、友達(ともだち)十(じゅう)年(ねん)目(め)です。

He and I are childhood friends, and we're in our 10th year of friendship. {childhood friend, friend from infancy, old playmate}

彼(かれ)は幼馴染(おさななじみ)で、恋愛(れんあい)対象(たいしょう)には絶対(ぜったい)になりません。

He is a childhood friend, and will absolutely never be a romantic interest. {childhood friend, friend from infancy, old playmate}

幼馴染(おさななじみ)の私(わたし)と彼女(かのじょ)は三(さん)歳(さい)のころから友達(ともだち)でいます。

She and I, who are childhood friends, have been friends since we were three years old. {childhood friend, friend from infancy, old playmate}

幼稚園(ようちえん)の頃(ころ)からの幼馴染(おさななじみ)とは今年(ことし)で友達(ともだち)歴(れき)二(に)十(じゅう)年(ねん)になります。

This year marks the 20th anniversary of my friendship with my childhood friend, who I've known since kindergarten. {childhood friend, friend from infancy, old playmate}

いくら幼馴染(おさななじみ)だからといって僕(ぼく)たちが何(なん)でも話(はな)せる仲(なか)だとは限(かぎ)らない。

Just because we are childhood friends does not necessarily mean we can talk about everything. {childhood friend, friend from infancy, old playmate}