people cannot live forever because of health, and stuff... If we were able to live forever we would not have sicknesses.. We eventually age and weaken and by the time your 80-90 you start to get little to major health problems and you cannot do everything on your own forever. It is sad that people die, good people and people we love but we all have to die for a reason, reasons we may never be able to explain, other than health problems or depression..