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[...] the research was impressive in its breadth, covering genetic information from well over 1 million people across three public databases. It also focused on three key measures of ageing: lifespan, years lived free of disease [...], and making it to an extremely old age.

Did one million people really volunteer to have their genes coded, their medical histories recorded, and their death certificates analyzed?

Were they all Chinese? Newfoundlanders? Belgians?

I'm also assuming that the data had been adjusted for race, socio-economic level, alcohol use, tobacco use, etc., right? So all that info, too, would have to have been compiled.

So my question: Were do you find one million people (who now must all be deceased) willing to divulge all of their personal info - including DNA samples?

Regards,