Yaknow there's a movie about everyone living forever and you basically pay with your lifespan.
Technology advances enough to cure all diseases and stop aging. I think age 23-28 is prime. Some people look way more grown up at 28 vs 18. Also you're body is done growing and starts breaking down in the mid 30s.
So yeah I'm thinking people are immortal via science. So it's sci-fi not fantasy.
In fantasy humans would ALWAYS have immortality. It's not like a switch is flipped in 1990 and suddenly people stop dying and aging.
Our society and culture would be completely different if death wasn't a thing. One of the reasons we have so many issues is religion. What religion would immortals have? What does war look like for immortals? How do you decide who wins a war when soldiers can't die? Violence loses its meaning with no death or injuries.
We'd all become non-violent. Maybe war would be decided by board games like chess. We'd be more open to talking things out instead of just killing and taking from each other.
Another issue with humans is overpopulation. Again resources being scarce and countries fighting over resources wouldn't be a thing in the way we have it today.
See how this goes down the rabbit hole?
Yeah In Time (2011) was there my brain went with the no death thing.
I only saw the trailer, but my mind went to a future state where we solved aging, illness, disease and the like with technology / medicines.
So we change our current culture to conform to that. Including late stage capitalism and the owning class.
Verses everyone STARTING immortal. Its an even playing field since the starting lines are closer together. You don't have generational wealth with people being born into wealth over and over at the same scale.
The head of the family that actually pulled themselves up from the bootstraps could still be alive and have the same core values of taking care of their workers. Instead of being dead and gone for 3 generations and enshittification takes root.