The next comes from a book I’ve actually read several times, a rare science-fiction novel worth reading even once – Camp Concentration (1969) by the late poet Tom Disch: “`Opsi?’ I asked Mordecai. `Short for opsimath—one who begins to learn late in life. We're all opsimaths here.’” The fact that I don’t remember encountering the word reconfirms the thesis stated above. The third citation from one of William F. Buckley’s sailing chronicles, Windfall: The End of the Affair (1992): “They took me thirty years to learn, opsimath that I am in so many matters.” There’s also opsimathy and, of course, polymathy and philomathy, and I’ve learned that English is generous and broad-minded enough to have a word for marriage late in life – opsigamy, once the standard for men in Ireland. The OED, as usual, is the opsimath’s sanction for pursuing endless digressions.