I once had a grandmum who will always wake up every morning angry that she didn't die in her sleep. I always wondered why someone would want to die. Sometimes she asks us to help kill her that she really wants to die. She was very old and frail. She later died at 104 years old.
I discovered that people tend to come to terms with death as they age. They have seen it all. Nothing amazes them anymore. They see at least two people they know die every year, they are tormented with old age sickness and have to go through excruciating pain. They have their children go away start a family and they are all alone with no one to care for them and sometimes sent to a nursing school where they only get perhaps weekly or monthly visits. The pleasures of this world do not entice them anymore. They become very dependant on others to do simple activities like walk, eat, pee etc and if they think back to the younger years, all they want is to just end it all.