It is not a fact , I think its a lie. It would be a fact if you gather evidence from all left handed people (who know how to write and read) who died in the last decade based on life expectancy. In 1991, the psychologists Stanley Coren and Diane Halpern claimed they had found the average life expectancy of lefthanders to be no less than nine years shorter than that of righthanders, because of the clumsiness of lefthanders, combined with the fact that most machines and appliances are designed for righthanded use. Fortunately, their claim was proved to be based on a flawed analysis and groundless. But this claimed has passed from person to person and the rumor had spread.