The answer to your question depends entirely on how you define "book."
If you mean printed book, our oldest item is from the 1460s (I can track down the exact date, but I'll need to do some comparisons). If you mean oldest complete book (as in codex format), that would be the Speculum sanctorale by Bernardus Gui, a complete manuscript codex from ca. 1370 CE. If you mean item from a book, as in a fragment, that would be a fragment from a lectionary produced at Luxeuil monastery (in modern Burgundy) ca. 715 CE. If you mean our oldest form of written document, that would be our set of Babylonian cuneiform tablets, the oldest of which dates to approximately 2500 BCE. As for most recent/newest book, you'd have to ask someone involved with our general/circulating collections. The Rare Books & MSS Library includes books produced in 2025 as well, but I couldn't provide you with specific day/month publication dates.
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