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Naked mole-rats can live longer than any other rodent, with lifespans in excess of 37 years; the next longest-lived rodent is the African porcupine at 28 years.[38][39][40] The mortality rate of the species does not increase with age, and thus does not conform to that of most mammals (as frequently defined by the Gompertz-Makeham law of mortality).[40] Naked mole-rats are highly resistant to cancer,[41] and maintain healthy vascular function longer in their lifespan than shorter-living rats.[42] Queens age more slowly than nonbreeders.[43]