"As a person who has cared for many people who died of cancer, that is not normal. Cancer claims people of all ages, young and old. Â Age has nothing to do with dying of cancer.
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Sorry. You are wrong. Â Nature never intended for a person to die in that hideous manner."
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To continue WildKingdom's comment, Nature doesn't care. To be more specific, Nature doesn't care as long as you're past reproductive age. You could spontaneously combust at menopause, and as long as that doesn't affect your children, Nature doesn't care. Also, age has an incredible amount to do with dying of cancer. If you don't have a genetic predisposition toward developing cancer, and you don't smoke, the likelihood is that you don't have to worry until age 60-70. And then you start to have to worry a lot. There are a number of really cool ways that your body protects itself against cancer, but that's only, again, typically foolproof until you've passed child-bearing age.
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You hear tons of stuff about heart disease, cancer, etc., because you're already living an unnatural life. You should be ridden with parasites (one reason for the uptick in autoimmune diseases - a bias toward the Th2 response) and typically die before age 40 due to infectious disease, or a predator. Unfortunately, vaccines, antibiotics, and antiviral drugs exist. And guns. If you want to learn about infectious disease, go live in the Democratic Republic of the Congo: http://news.yahoo.com/measles-kill-over-1-000-dr-congo-children-202705179.html.