How old would Siegmund Nimsgern be today?

Siegmund Nimsgern was a German bass-baritone who made an international career. His signature roles were "evil, dark, ambiguous figures" such as Pizarro in Beethoven's Fidelio and Telramund in Wagner's Lohengrin. Other dark roles he performed include Kaspar in Weber's Der Freischütz, Ruthven in Marschner's Der Vampyr, Klingsor in Wagner's Parsifal, Scarpia in Puccini's Tosca, Bartók's Bluebeard and Hindemith's Cardillac. He performed at La Scala in Milan and the Metropolitan Opera in New York, and portrayed Wotan in Wagner's Der Ring des Nibelungen at the Bayreuth Festival from 1983 to 1986. He was also known for performing works by Bach in concert and in recordings, including cantata cycles and major works with Nikolaus Harnoncourt and Helmuth Rilling. He recorded Schoenberg's Die Jakobsleiter and Gurre-Lieder conducted by Pierre Boulez and took part in a 1989 recording of Lohengrin that won a Grammy Award.