Run the Jewels is a hiphop duo comprising Killer Mike and ElP, who are both forty-one years old. Their third album “Run the Jewels 3” was released over the holidays and has garnered critical acclaim. The duo even recently starred in a Portlandia sketch. The New Yorker’s Hua Hsu is a longtime fan of both artists. He tells David Remnick how Run the Jewels’s music uniquely addresses the problems of being a middleaged rapper – or just being middle aged.