every “ancient tradition” was invented between 1848-1870 and every “modern perversion” is so ancient as to predate writing
Sometimes even later. In local politics (from my POV) "this is how it's always been done" refers to something that had existed about 20 years when the boomers were born.
(So interwar.)
(The amount of critique in local politics we get for women keeping their own surnames or giving mother's surname to the kid is surprisingly high, considering the legistlation about giving father's surname to kid was only in the books from about 1920 - 1986.)