How old was John Eisenhower when lynda bird johnson was born?

What was the age (length of time since creation) of John Sheldon Doud Eisenhower (born August 3, 1922), the retired United States Army officer and the author of several books of military history at the time Lynda Bird Johnson Robb (born March 19, 1944 ), the elder of the two daughters of United States President Lyndon Baines Johnson and his wife, Lady Bird Johnson 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:
March 19th 1944 is the birthdate of Lynda Bird Johnson Robb ([fact: ["18372055@trueknowledge.com"]])

August 3rd 1922 is the birthdate of John Eisenhower ([fact: ["18362649@trueknowledge.com"]])

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 21 years, 7 months and 16 days old is the age of John Eisenhower

Fact 1 is true at March 19th 1944

By calculation (generator: ["applies_at_timepoint@trueknowledge.com"]) I know that:
Fact 1 is true at March 1944

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 21 years, 7 months and 16 days old is a age

Fact 1: 21 years, 7 months and 16 days old applies to John Eisenhower

Fact 1 is true at March 19th 1944

By calculation (generator: ["ismoreaccurate1@trueknowledge.com"]) I know that:
March 19th 1944 is a more accurate version of March 1944

I used the following facts to provide this answer:

March 19th 1944 is the birthdate of Lynda Bird Johnson Robb

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August 3rd 1922 is the birthdate of John Eisenhower

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