The life expectancy depends on how strong you are in your interior,and to seek information from scientists, neurobiologos, for the comfort....And I can tell you of a few healthy people...Anything, they are healthy,until they say otherwise.We suffer physical pain and emotional and we don't have the energy to help others...We are a burden.And so I say around you because it is logical that they are tired, everyone wants to live their life fully,so that some who suffer depression like me ,want to die not to live.And the breakthrough scientists does not come to your house, you don't have the strength to move, although it is nice to think that people are impressed every professional for their persistence and every self-help group.Like this.