Every human one day will die.This has happened through out the ages.
Through out human's recorded existence on earth natural disasters, pestilences, famines, wars and man-made destructive behaviors and just "bad-luck" ( a car accident) have always found a way to keep the population in "equilibrium".
Immortality is impossible on this earth for mankind or any animal. There is "nothing new under the sun."
We are still trying to find out how the stonehedge and other ancient wonders were built and set up.
Ancients also had great intelligence, but still died.
Science and Medicine only can prolong life for so long.
I do not believe that it is immoral to think or strive for immortality.The best of mankind only has finite intelligence. Man is not infinitely intelligent. It would take an infinite intelligence for immortality.
Read Alfred Wallace's differing view with Darwin on natural selection
http://en.wikipedia.org/wiki/Alfred_Russel_Wallace
Dreaming is good and health.
Have fun and enjoy this finite thing called life.
.