I pose to you a choice.
You have some of the greatest minds in the world all getting together. We give them 30 years to work on something. You are given two choices for them to work on. Naturally all of their time and work will have to go towards only one, it cannot be both.
You can have them work on space travel, so that we can populate the solar system and possibly beyond that, so that we can survive as a species.
-or-
You can have them work on immortality, so that aging will be a thing of the past. We will grow old, but will never die, so that we can continue to live and prosper.
What would your choice be and why?