We came to this life, with different purpose, at different times, for different reason.
Some come and in less than a month, they die, some instantly, others get to spend few years and others get to achieve more. But there are some set of people that outlive their usefulness and still yet they are still here, then you wonder, what are they still doing, won't they die etc.
The truth is, everyone still struggles to find out why they are on earth, no one truly knows. The best thing 6ou can do is, live your life to the fullest and leave the rest to God.
What kind of life is this? We will never truly know, because why the poor ask this question in the time of adversary and struggle, the rich still ask the question. No one truly knows.