How old was James Buchanan when georg gaenswein was born?

What was the age (length of time since creation) of James Buchanan, Jr. (April 23, 1791June 1, 1868, ), the 15th President of the United States (1857–1861) at the time Georg Gänswein (born 30 July 1956 in Riedern am Wald, Waldshut, Baden-Württemberg), the German priest of the Roman Catholic Church, and the personal secretary of Pope Benedict XVI is born on (has as his or her date of birth)?

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Show reasoning Reasoning

I followed this chain of reasoning:

I know from locally stored knowledge that:
July 30th 1956 is the birthdate of Georg Gänswein ([fact: ["18939912@trueknowledge.com"]])

April 23rd 1791 is the birthdate of James Buchanan ([fact: ["1148176@trueknowledge.com"]])

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 165 years, 3 months and 7 days old is the age of James Buchanan

Fact 1 is true at July 30th 1956

By calculation (generator: ["applies_at_timepoint@trueknowledge.com"]) I know that:
Fact 1 is true at July 1956

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 165 years, 3 months and 7 days old is a age

Fact 1: 165 years, 3 months and 7 days old applies to James Buchanan

Fact 1 is true at July 30th 1956

By calculation (generator: ["ismoreaccurate1@trueknowledge.com"]) I know that:
July 30th 1956 is a more accurate version of July 1956

I used the following facts to provide this answer:

July 30th 1956 is the birthdate of Georg Gänswein

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April 23rd 1791 is the birthdate of James Buchanan

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