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young fogey

n. (context idiomatic English) young and over-conservative person.

Wikipedia
Young fogey

"Young fogey" is a term humorously applied, in British context, to some younger-generation, rather buttoned-down writers and journalists, such as Simon Heffer, Charles Moore and, for a while, A. N. Wilson. The term is attributed to Alan Watkins writing in 1984 in The Spectator.

"Young fogey" is still used to describe conservative young men (aged approximately between 15 and 40) who dress in a vintage style (usually that of the 1920s-1950s, also known as the "Brideshead" look (after the influence of the Evelyn Waugh novel Brideshead Revisited), and who tend towards erudite, conservative cultural pursuits. The young-fogey style of dress also has some surface similarity with the American preppy style, but it is essentially an Anglo-centric style, restricted to the United Kingdom and the more anglicised areas of the British Commonwealth such as Australia and New Zealand.