"Based on the data [if we live healthily], I would predict that most people could live to 95 in good health. So there's 15 to 17 [extra] years of healthy life that is up for grabs for all of us," he told me.
The big question, which Mr Verdin and others are investigating, is what does a healthy lifestyle mean? Take exercise for example - should that be a daily stroll, or a HIIT class?