Usage History of 'lifelong'

The following chart shows how frequently 'lifelong' appeared in printed materials over time. For example, the word 'lifelong' occurred 2 times in books in 1520 and 192,561 times in 2008. From 1520 to 2008, the word 'lifelong' was used a total of 3,601,864 times in books scanned by Google. See Reference: Google Ngram project.

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