An example of "Cause of Death" statistics:
In 2017, an actor - Mike Connors - ("Mannix") died. He was 91, which is a pretty long life span.
His cause of death was listed as "Leukemia."
After that many years, our immune system is not working as well as when we were young.....along with everything else. At some point, it is no longer able to control the growth of cancer cells, which we all have in our bodies. At that age, we also can't tolerate the toxic treatment - which is why they referred to his cancer as "Not Treatable" which means the treatment would cause death.
Same with someone whose balance is bad & causes falls - which are sometimes fatal in older people; due to the fall or pneumonia from lying in bed during a longer recovery, which causes fluid buildup in the older, tired lungs - which have been filtering impurities for many years.
The term: "Natural Causes" is rarely listed as the cause of death; even though that's what it usually was.
We all gotta die of something; we aren't designed to live forever.