How old was Ernest I, Duke of Saxe-Gotha when Dorothea Maria of Anhalt died?

What was the age (length of time since creation) of Ernst I, Duke of Saxe-Gotha and Altenburg, called "the Pious" (Altenburg, 25 December 1601 – Schloss Friedenstein, Gotha, 26 March 1675), the duke of Saxe-Gotha and, by marriage, became also Duke of Saxe-Altenburg at the time Dorothea Maria of Anhalt (Dessau, 2 July 1574 - Weimar, 18 July 1617), by birth a member of the House of Ascania and princess of Anhalt is someone who died on?

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I followed this chain of reasoning:

I know from locally stored knowledge that:
July 18th 1617 is the date of death of Dorothea Maria of Anhalt ([fact: ["145298953@trueknowledge.com"]])

December 25th 1601 is the birthdate of Ernest I, Duke of Saxe-Gotha ([fact: ["802061440@trueknowledge.com"]])

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 15 years, 6 months and 23 days old is the age of Ernest I, Duke of Saxe-Gotha

Fact 1 is true at July 18th 1617

By calculation (generator: ["applies_at_timepoint@trueknowledge.com"]) I know that:
Fact 1 is true at July 1617

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 15 years, 6 months and 23 days old is a age

Fact 1: 15 years, 6 months and 23 days old applies to Ernest I, Duke of Saxe-Gotha

Fact 1 is true at July 18th 1617

By calculation (generator: ["ismoreaccurate1@trueknowledge.com"]) I know that:
July 18th 1617 is a more accurate version of July 1617

I used the following facts to provide this answer:

July 18th 1617 is the date of death of Dorothea Maria of Anhalt

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December 25th 1601 is the birthdate of Ernest I, Duke of Saxe-Gotha

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