I don't think there is any way to calculate a person's exact death age. If there is a way, everyone could know when he will die and do things in advance. In fact, I think you can estimate your longevity by your living habit. If you often do exercises, always being optimistic, not particular about trifles, seldom stay up late, don't drink and smoke heavily and seldom eat oily food, you could live after 80 years old. Also, there are hereditary factors. If your parents or grandparents live long, you could. Don't spend time concerning about the age, liver happily everyday is important.
I don't think there is any way to calculate a person's exact death age. If there is a way, everyone could know when he will die and do things in advance. In fact, I think you can estimate your longevity by your living habit. If you often do exercises, always being optimistic, not particular about trifles, seldom stay up late, don't drink and smoke heavily and seldom eat oily food, you could live after 80 years old. Also, there are hereditary factors. If your parents or grandparents live long, you could. Don't spend time concerning about the age, liver happily everyday is important.