Immortality is never an option, even if scientists reached a certain point where they find a certain cure or something that extend human lives, it won't work.
Imagine a world with a very low rate of death facing a very high rate of birth. people would not find enough resources for their food and needs. they will die... immortality could never be reached, and if it was reached people will die starving, killing each others and fighting over resources, lands etc...
Personally, i find life in its current age average good enough for me
