Seems like knowing when you’re going to die might be evolutionarily useful to the rest of the tribe, and it might seem normal if we somehow died multiple times in a year.
I lived in the countryside as a kid and saw several generations of our farm cats come & go. We never found out where and when they died, but all of them lived a long (cat) life and I‘m pretty sure most of them died of old age.
My assumption is that humans can feel that their time is coming as well, and apparently the experience seems to be similar for all of us.
That's what I was going to say, the only death I directly experienced was a cat, it 100% knew it was going to die, days before
I have absolutely no doubt other animals, including humans, can feel it too (depending on the cause of death of course)