Right, it would make much more sense to talk about cancer diagnosis or survivability by a certain age, like 50 or 60. By 70-90 most people have been exposed to so many carcinogens the likelihood of some sort of cancer is near guaranteed.
It's not even carcinogens. Cellular decay is a thing. As we age, our genetics start breaking down due to imperfect copying. Cancer is basically just bugs in DNA's software.