Premise: Artur Edler von Mecenseffy (23 June 1865, Vienna — 6 October 1917, Asiago) was an Austro-Hungarian Army officer who held the rank of "Feldmarschall-leutnant" ("lieutenant field marshal") and served during World War I, becoming the highest ranking officer of Austria-Hungary to be killed on the battlefield.
Hypothesis: Mecenseffy was 52 years old when killed in battle during World War I.