100 years ago is 1909, therefore it is the 20th century.
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The year 100 was the last year of the 1st century AD. As of the 4th of March 2015 that is just over 1914 years and 2 months ago.
A century is 100 years.100 yearsThere are 100 years in a century.
There were 100 years in the 20th century.
A 100 years is a century
A period of 100 years is called a century.