How does Buddhism explain that people die unexpectedly before reaching Shoulu?

Fate, it is fate, according to past lives to determine the fortune of this life, life expectancy is the same. Although this is decided, if you do evil in this life, the yin method is selfless. For example, fortune tellers say they can live to be 80, but they will leave before they are 80. In fact, this person's life span has been reduced to the following. Some people have done good deeds in their lives, such as often releasing them. This is a great advantage, you think.