How old was julie nixon when caroline kennedy was born?

What was the age (length of time since creation) of Julie Nixon-Eisenhower (born July 5, 1948), the second daughter of 37th U.S. President Richard M. Nixon and First Lady Pat Nixon, and sister to Patricia Nixon Cox at the time Caroline Bouvier Kennedy (born November 27, 1957), the daughter and only surviving child of U.S. President John F. Kennedy and his wife, Jacqueline Kennedy Onassis 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:
November 27th 1957 is the birthdate of Caroline Bouvier Kennedy ([fact: ["125751730@trueknowledge.com"]])

July 5th 1948 is the birthdate of Julie Nixon Eisenhower ([fact: ["18465243@trueknowledge.com"]])

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 9 years, 4 months and 22 days old is the age of Julie Nixon Eisenhower

Fact 1 is true at November 27th 1957

By calculation (generator: ["applies_at_timepoint@trueknowledge.com"]) I know that:
Fact 1 is true at November 1957

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 9 years, 4 months and 22 days old is a age

Fact 1: 9 years, 4 months and 22 days old applies to Julie Nixon Eisenhower

Fact 1 is true at November 27th 1957

By calculation (generator: ["ismoreaccurate1@trueknowledge.com"]) I know that:
November 27th 1957 is a more accurate version of November 1957

I used the following facts to provide this answer:

November 27th 1957 is the birthdate of Caroline Bouvier Kennedy

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July 5th 1948 is the birthdate of Julie Nixon Eisenhower

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