Comment 5 by godzillatemple :

As an atheist, all I can really tell him is that death is a part of life and that it's something all creatures on earth will experience someday. I can tell him that living forever would cause a lot of problems due to overpopulation and scarcity of resources (not to mention the inevitable boredom inherent in living for billions of years, let alone forever).

You could tel him that due to advances in medicine he has a good shot on leaving long enough to live in a time where his live can be prolonged by technology so long that he will be so bored to death that he at some day will want to die.

Or may be, we will just downlaod the minds af all old people into the google cloud where they will exist until out run blows up and the system gets blasted alway with the earth.

imho. this are possibilities that are possible during the next 100 years or so.

David X.