Real world political axe grinding and 'it's your duty to die on-schedule so we can re-distribute the food, money, land you were using to the next generation like communists, rather than reduce everybody to sustainable (and much smaller) levels of all of the above resources *also* like communists' is boring.
Also off-topic. Which is transhumanism *in games.*
Reincarnate, raise dead, resurrection, lichdom, other types of undead-ness, class capstone ageless traits, turning into a petitioner and then a fiend or celestial, etc., as well as simply polymorphing into something with a vastly greater lifespan (like an elf or dragon) are all more relevant, when talking about extending life.
Actually *transforming* life, via turning into other creatures, or redefining what it means to be 'alive' (via becoming undead, or some sort of sentient construct) or a person (becoming a sentient plant creature or ooze creature or just an awakened animal) adds all sorts of non-life-extension-related transhuman themes.
It could be interesting to see how 'self' is legally perceived in a world where a person can transition into another race, magically, or be unwillingly transitioned to another status (such as petitioner or undead or even vegepygmy). The churches obviously know that souls transition into petitioners.
In Golarion, there's even a nation that explicitly gives intelligent undead the same rights as living people, but it's not clear if all (or any) undead are automatically regarded as *the same person* for the purposes of things like rights of retaining property owned in life, etc. Some undead seem pretty clearly to be the same person (template undead, like liches). Others seem to be completely different spirits animating the bodies, or incorporeally aping the general appearance of, a previous living person, and seeming to be no more 'that person' than a patch of green slime that used to be a person is 'that person.'