How old was Bess Truman when Edna Ferber was born?

What was the age (length of time since creation) of Elizabeth Virginia Wallace Truman (February 13, 1885 – October 18, 1982), widely known as Bess Truman, the wife of Harry S. Truman and First Lady of the United States from 1945 to 1953 at the time Edna Ferber (15 August 1885 – 16 April 1968), the American novelist, author and playwright 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:
August 15th 1885 is the birthdate of Edna Ferber ([fact: ["19254654@trueknowledge.com"]])

February 13th 1885 is the birthdate of Bess Truman ([fact: ["19248343@trueknowledge.com"]])

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 6 months and 2 days old is the age of Bess Truman

Fact 1 is true at August 15th 1885

By calculation (generator: ["applies_at_timepoint@trueknowledge.com"]) I know that:
Fact 1 is true at August 1885

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 6 months and 2 days old is a age

Fact 1: 6 months and 2 days old applies to Bess Truman

Fact 1 is true at August 15th 1885

By calculation (generator: ["ismoreaccurate1@trueknowledge.com"]) I know that:
August 15th 1885 is a more accurate version of August 1885

I used the following facts to provide this answer:

August 15th 1885 is the birthdate of Edna Ferber

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February 13th 1885 is the birthdate of Bess Truman

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