How old was Dean Rusk when Donald Coggan was born?

What was the age (length of time since creation) of Dean Rusk (1909-1994), the American politician & diplomat at the time Frederick Donald Coggan, Baron Coggan, PC, the 101st Archbishop of Canterbury from 1974 to 1980, during which time he visited Rome and met the Pontiff, in company with Bishop Cormac Murphy-O'Connor, future Cardinal of England and Wales 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:
December 23rd 1909 is the birthdate of Donald Coggan ([fact: ["137777659@trueknowledge.com"]])

February 9th 1909 is the birthdate of Dean Rusk ([fact: ["18342136@trueknowledge.com"]])

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 10 months and 14 days old is the age of Dean Rusk

Fact 1 is true at December 23rd 1909

By calculation (generator: ["applies_at_timepoint@trueknowledge.com"]) I know that:
Fact 1 is true at December 1909

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 10 months and 14 days old is a age

Fact 1: 10 months and 14 days old applies to Dean Rusk

Fact 1 is true at December 23rd 1909

By calculation (generator: ["ismoreaccurate1@trueknowledge.com"]) I know that:
December 23rd 1909 is a more accurate version of December 1909

I used the following facts to provide this answer:

December 23rd 1909 is the birthdate of Donald Coggan

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February 9th 1909 is the birthdate of Dean Rusk

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