What is the moral lesson of the story "A Clean, Well-Lighted Place" by Ernest Hemingway?

Each of
the three characters in "A Clean
Well-Lighted Place" byis in a different stage of
life: the young waiter, the
older waiter, and the old man. As in any work, several possible
themes
emerge; one of the prominent themes in this story is that we (mankind) will all
age
ourselves into despair and nothingness.

The young
waiter is impatient with
the old man who comes in to drink at this late-night
cafe will not leave because the waiter
wants to go home. He has no patience
with the old man who is deaf and old and tried to commit
suicide last week;
the old man is drinking too much and too slowly to suit the impatient young

waiter who just wants to go home. The young waiter thinks that happiness comes from
having money
and thinks the old man should have gone ahead and killed
himself. He says, "I wouldn't want
to be that old. An old man is a nasty
thing." The young man has reasons to live, for now,
and gives no
consideration to...