I should live to be 90

I found this lifestyle quiz on eons.com (OK, LivingTo100.com if you are under 50 and still have a crack at this). Now I don't do quizzes, having had quite enough of taking and giving them in my university career. However, I thought I might learn something, and so I did. If I would religiously floss my teeth daily, which I will confess doesn't happen, I would statistically gain a quarter of a year. Is it worth it? Doesn't my trusty Sonicare do a good enough job? I also completed the quiz for G, who will predecease me by 14 years, statistically speaking. Why am I not surprised?