How old was david o mckay when joseph kennedy sr was born?

What was the age (length of time since creation) of David Oman McKay (September 8, 1873-January 18, 1970), the ninth president of The Church of Jesus Christ of Latter-day Saints (LDS Church), serving from 1951 until his death at the time Joseph "Joe" Patrick Kennedy, Sr. (September 6, 1888 - November 18, 1969), the prominent United States businessman and political figure, the father of President John F. Kennedy and Senators Robert F. Kennedy and Ted Kennedy 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:
September 6th 1888 is the birthdate of Joseph P. Kennedy ([fact: ["17999322@trueknowledge.com"]])

September 8th 1873 is the birthdate of David O. McKay ([fact: ["18588440@trueknowledge.com"]])

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 14 years, 11 months and 29 days old is the age of David O. McKay

Fact 1 is true at September 6th 1888

By calculation (generator: ["applies_at_timepoint@trueknowledge.com"]) I know that:
Fact 1 is true at September 1888

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 14 years, 11 months and 29 days old is a age

Fact 1: 14 years, 11 months and 29 days old applies to David O. McKay

Fact 1 is true at September 6th 1888

By calculation (generator: ["ismoreaccurate1@trueknowledge.com"]) I know that:
September 6th 1888 is a more accurate version of September 1888

I used the following facts to provide this answer:

September 6th 1888 is the birthdate of Joseph P. Kennedy

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September 8th 1873 is the birthdate of David O. McKay

agree disagree edit