My inclination is that this could still just be a selection effect. For people who are prone to cancer, you are probably dead by 80.
https://www.cancer.gov/about-cancer/causes-prevention/risk/a...
Hardly a consolation.
The other thing to consider is that once you get to 85, you're likely to die from just about everything else, not just heart disease and cancer.
Doctor: Oh no, and in fact even a slight breeze could k…
Mr Burns: Innndestructibllllle.
Cancer at a later age, like at 85, is "less risky", because you'll be likely to die of something else than the cancer before you're 90 anyway.
Cancer at a later age, like 60, is "less risky" because your body have had plenty of time to grow indolent and lazy cancers by then, and your immune system is winding down, letting them bloom up a bit.
Cancer at like 30, while many are treatable nowadays, is usually bad news as why are you having cancer at 30 of your genes aren't massively prone to spawn cancer or you had some environmental exposure to serious mutagens.
But even in the older age categories there's plenty of really nasty cancers that lead to ugly deaths, which is why I don't like generalizations like this.
And then always researchers try to find a clue in the patient and see like oh hey they have more iron, iron must be the solution, but maybe the person just didn't get cancer because (s)he had a healthy lifestyle and relatively little stress.
I'm not saying that these are the cause, but there are ton of similar, simple statistical arguments you'd have to rule out before arriving at a relatively complex conclusion about human biology.
Prostate cancer is surprisingly prevalent but (commonly) slow-proliferating, and is often “beaten to the punch” by other causes of mortality.