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Apple removed several years' worth of Macs from the list of supported systems when it unveiled macOS 10.14, aka "Mojave," earlier this month.
As the Cupertino, Calif. company has done before, its two-year cycle scratched out Macs that had been able to run the immediate predecessor, macOS High Sierra. Apple's odd-even cadence has alternately retained the prior year's models (odd-numbered years, odd-numbered editions) and dropped models (even-numbered years, even-numbered editions).
In 2016, for instance, macOS Sierra (10.12) struck 2007's, 2008's and some of 2009 Macs from support. Last year, High Sierra (10.13) stuck with the same models as Sierra.