I always figured that ethically, the folk of the future was pretty happy with what they had, and that the driving force was to be better humans without using technology to indefinitely extend their lives. Sure, there're crotchety old Admirals who get to be 137 or older, who are certainly being kept alive with daily injections, entertainment therapy and kidney-growing Tylenol. But overall, the idea seems to be to make the best of the years you have, rather than worry about adding more of them onto the pile.
Humans weren't born to be immortal (unless you're Flint), so we should have fun before some moron figures we should all be pure energy instead.
Mark