Question

Why do people need to die at some point?

Answer 1

from a secular perspective, there are multiple different things that lead to death we classify these things usually as "natural causes" but they can be a vast array of reasons for death.

Answer 2

Many people will pass away from age, getting old is a common way of how people will pass away.

Unexpected accidents, you can't control accidents. Many people will pass away from an unexpected accident that happens really often in the world.

Hope this helped!