1) Do you agree with the "general" defintion of having a life?
Yesss, I do.
2) What's your definition of having a life?
It just so happens to be the "general" definition of having a life.
and finally 3) Are there any group of people you believe that have "no life"?
A group of people? I'm certain that there's probably one in the entire world that has no life, but I don't know of their existence. So I suppose not.