The Mediterranean diet is also likely to be a factor in Italian longevity.

BBC: Why do the Italians live longer than us?

However, an important factor to consider is longevity and the amount of time that this money will have to last.

FORBES: The Early Retirement Income Challenge: Longevity

Levering is helping the Society of Actuaries with its mission to improve Americans understanding of longevity and its variability, and how to factor it into their retirement planning.

FORBES: Americans Clueless About Life Expectancy, Bungling Retirement Planning