old school
old school (adjective old-school)
school
(学問･芸術の)流派, …派, 学派; 考え方
古い考え方
https://gyazo.com/32b2dfa689f159d7829beaec7b12054a
source: [居間にいる波平がマスオとサザエを叱っているGIF画像｜無料GIF画像検索 GIFMAGAZINE 56814]
noun (often of the old school/from the old school)
used, usually approvingly, to refer to someone or something that is old-fashioned or traditional: 通常賛成的に、古風、伝統的な人、ものに言及するのに使われる
旧来の, 伝統的な, 保守的な
e.g. amenities that my parents, being of the old school, still take for granted.: 保守的な私の両親が依然として当たり前と考えている礼儀