First, what is your life purpose?
To have a loving family. To enjoy every day as if it were my last.
To be fulfilled, content and happy.
Second, What do you think about die? What will happening when we die?
When you die your cells die, chemical reactions that support life stop. You decompose.
Your energy content is returned to Earth so that other life forms can benefit from it.
The last is, Why are we life in this world?
Why we have life?
Shit happens. It happened on Earth and it probably happened elsewhere in the universe.
What is the purpose of each life form?
To procreate. To become more complex over time.
I agree, our body evolve to a certain where it will be immune to any kind of disease anymore, in short it will be immortal. We have different species that been successful to this kind of evolution like jellyfish.