Here’s a fun what-if simulation that imagines a world where all natural causes of death were gone. People only die of things like car crashes and homicide. The result: people who live to thousands of years old.
Of course, this assumes that the likelihood of dying from external causes stays the same. With such a long life expectancy, do people start to take more risks? Or do we become more sloth-like because we have all the time in the world? Ah, that’s a thinker.
Want a simulation closer to reality? Here you go.