How old was Thomas Edison when Alexander Graham Bell was born?

What was the age (length of time since creation) of Thomas Alva Edison, the American inventor, scientist and businessman who developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and a long-lasting, practical electric light bulb at the time Alexander Graham Bell (3 March 1847 – 2 August 1922), the eminent Scottish born scientist, inventor and innovator who is credited with inventing the first practical telephone 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 3rd 1847 is the birthdate of Alexander Graham Bell ([fact: ["18406060@trueknowledge.com"]])

February 11th 1847 is the birthdate of Thomas Edison ([fact: ["19290823@trueknowledge.com"]])

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 20 days old is the age of Thomas Edison

Fact 1 is true at March 3rd 1847

By calculation (generator: ["applies_at_timepoint@trueknowledge.com"]) I know that:
Fact 1 is true at March 1847

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 20 days old is a age

Fact 1: 20 days old applies to Thomas Edison

Fact 1 is true at March 3rd 1847

By calculation (generator: ["ismoreaccurate1@trueknowledge.com"]) I know that:
March 3rd 1847 is a more accurate version of March 1847

I used the following facts to provide this answer:

March 3rd 1847 is the birthdate of Alexander Graham Bell

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February 11th 1847 is the birthdate of Thomas Edison

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