Josef Groll (21 August 1813, Vilshofen an der Donau – 22 November 1887, Vilshofen) was a Bavarian brewer, best known for his invention of Pilsener beer, is known by some as "the Father of the Pils". The world's first-ever pale lager, his Pilsner Urquell was highly successful, and served as the inspiration for more than two-thirds of the beer produced in the world today. Using only the above description and what you know about the world, "Josef Groll was 90 years old when he died." is definitely correct, incorrect, or inconclusive? 