Life expectancy of an individual depends upon many factors. Yes some may live to be 90 or 100 but for most part your life expentancy was on the average in this time less then 60 years old. Now a days the life expenacy of an average person is 70 to 80 years. In my family the woman live to be 90 years on average but the males live to around 70, so there is quite a difference depending on many factors. So it really depends on diet, exercise and other factors I can't explain at this moment. But, in this game you can't expect everyone to live to 80 years old, it doesn't happen with most families.

So don't expect there to be a common denominator. It all happens on percentage, depending on many different factors.