Life Expectancy

The age calculator determined my life expectancy to be in the upper 80s, I felt it was probably a fairly accurate estimation.  I would find it interesting to how many of these predicted years would yield a good quality of life instead of purely living though.  One of the criteria I was most surprised by was that flossing daily can add a year to your life.  I found it interesting that there was a link between "the inflammation of gum disease and heart disease".  This must be a very significant link to affect an entire year of someone's life.  One factor I thought might be misleading was the question about sweets.  I feel I eat small amounts of sweets frequently, although the amount was not taken into account in the questionnaire.  I also feel that I am under more stress and put in more hours studying-which I considered my job than I hope to be under when I enter the work force.  I also wonder how this life expectancy calculator would have measured some of the centenarians discussed in class since we've talked about their longevity and bad habits.-just an interesting thought.