> If you have a healthy lifestyle you would need to live for multiple centuries to reach 100% likelihood.

Well, 100% likelihood is a bit silly, but the point of the person you were responding to is true -- we will all eventually die of something, and if it's not heart disease or dementia, it will almost certainly be cancer.

The question shouldn't be "will I get cancer?"; it should be, "how long do I want to live a happy, healthy, active, independent lifestyle for?" If you exercise, eat a healthy diet, don't become overweight and keep your blood pressure low, you'll maximise your changes for living well, for as long as possible.