@ink_slinger @suetanvil And that's assuming we don't get clobbered by an asteroid or some other civilization-ending catastrophe first.
The way humanity will achieve immortality is though our synthetic descendants. They may carry our literal memories because we figured out upload, or they may just carry our values. But they will live in vacuum, possibly spending most of their way plying the interstellar depths to explore new star systems and carry interstellar mail.