In a book that contemplates the use of death in our life's, I don't know if I ever came up with an answer but I also don't think that was the point. Being my first DeLillo, I enjoyed the way he writes about experiencing life, making banal and mundane moments and thoughts seem almost profound. Whether the lack of grasping the topic was by design or that I enjoyed it it less than I wanted to, I still like the message it imprinted on me. 

SPOILERS
Jeff's rich father created a facility in a remote area of Central Asia that lets those who are close to death be cryofrozen to be brought back to life in the future in a society they seem convinced will have the resources and technology to have solved all of today's problems. Jeff's father decides to undergo this as well even as a healthy man and so Jeff is left to contemplate to himself on whether it's ridiculous and stupid to choose this and pretend to never die or rather that death is just a part of a cycle of moments and experiences that dull and evaporate if things just go on forever.