you will die when your time is up there are many different ways a person can die. Here is a few examples of the various ways;
Hit by a vechile
Heartattack
Stabbed by a chav or 'rudeboy' for your phone
contract life threatening disease
old age - simply the body gives in , heart ceases to beat
there is no time we can put on our deaths, it could be anytime we could all die today if an asteriod hit who knows