Expiration date. The OED’s first citation is from 1963, while the first metaphorical use is a Daily Telegraph headline (OED calls it a “heading”) from 1987: “Socialism: the package that’s passed its sell-by date.” Sell-by date is not only more precise than expiration date but also is more mellifluous. Hence its appeal for now-inescapable and wearisome metaphorical applications. (Of the last 20 uses in the New York Times, only five refer to foodstuffs and fifteen to people, ideas, etc.) Google Ngram.
Ms. [Kathleen Hall] Jamieson’s list of double binds is a little past its sell-by date.(New York Times, April 2, 1995) /And the hippie-with-an-expired-sell-by-date look suits him [Paul Rudd] well. (Entertainment Weekly, January 24, 2011)