Studies have shown that, contrary to popular belief, middle-aged people have more fear of dying than do elderly people. Each of the following, if true, contributes to an explanation of the phenomenon shown by the studies EXCEPT: ['The longer one lives, the more imperturbable one becomes.', 'Middle-aged people have more people dependent upon them than people of any other age group.', 'Many people who suffer from depression first become depressed in middle age.', 'The longer one lives, the more likely it is that one has come to terms with dying.']