You have to completely solve the population explosion issue before anyone who is likely to write about it, will be immortal.
Since that issue seems likely to exist for the next 50 years, I doubt anyone alive today will be immortal, or if they are it'll be maybe limited to zuckerberg - I can't think of anyone else young enough and rich enough to benefit from it.
Thing is its not like most medical procedures stay inaccessible for that long once they're proven to work. Maybe zuck would be fortuitous if he was on his deathbed and something came out, but give anything a few years and it'll be available to the masses. And that hopefully will become more true with time.
Since that issue seems likely to exist for the next 50 years, I doubt anyone alive today will be immortal, or if they are it'll be maybe limited to zuckerberg - I can't think of anyone else young enough and rich enough to benefit from it.