My boyfriend does not have material desires. You could also say that he has no desire to possess things. He is a rare person for this age.
ご質問ありがとうございます。
"My boyfriend does not have material desires."＝「私の彼氏は物欲がありません。」
"You could also say that he has no desire to possess things."=「彼は所有欲がないとも言えます。」
"He is a rare person for this age."＝「彼はこの時代には珍しい人です。」
ご参考に。
My boyfriend is not the least bit materialistic, which is kind of unusual these days.
この場合、次のような言い方ができますよ。
ーMy boyfriend is not the least bit materialistic, which is kind of unusual these days.
「私の彼氏は、全然物欲がない、今時珍しい人です」
materialistic「物質主義の」
ご参考まで！
アメリカ合衆国 
カナダ 
