How old was Grand Duke Boris Vladimirovich of Russia when duchess Marie of Mecklenburg-Schwerin died?

What was the age (length of time since creation) of Grand Duke Boris Vladimirovich of Russia, the son of Grand Duke Vladimir Alexandrovich of Russia, a grandson of Czar Alexander II of Russia and a first cousin of Czar Nicholas II. He followed a military career and at the time Grand Duchess Maria Pavlovna of Russia, known as "Miechen" or "Maria Pavlovna the Elder" (May 14, 1854 - September 6, 1920), born Marie Alexandrine Elisabeth Eleonore of Mecklenburg-Schwerin is someone who died on?

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I followed this chain of reasoning:

I know from locally stored knowledge that:
September 6th 1920 is the date of death of Marie of Mecklenburg-Schwerin ([fact: ["125267134@trueknowledge.com"]])

November 24th 1877 is the birthdate of Grand Duke Boris Vladimirovich of Russia ([fact: ["125440379@trueknowledge.com"]])

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 42 years, 9 months and 13 days old is the age of Grand Duke Boris Vladimirovich of Russia

Fact 1 is true at September 6th 1920

By calculation (generator: ["applies_at_timepoint@trueknowledge.com"]) I know that:
Fact 1 is true at September 1920

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 42 years, 9 months and 13 days old is a age

Fact 1: 42 years, 9 months and 13 days old applies to Grand Duke Boris Vladimirovich of Russia

Fact 1 is true at September 6th 1920

By calculation (generator: ["ismoreaccurate1@trueknowledge.com"]) I know that:
September 6th 1920 is a more accurate version of September 1920

I used the following facts to provide this answer:

September 6th 1920 is the date of death of Marie of Mecklenburg-Schwerin

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November 24th 1877 is the birthdate of Grand Duke Boris Vladimirovich of Russia

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