I'm not sure whether the Health section is appropriate for this post. If it isn't, could a moderator move it into the "Everything Else" section?
I don't think anyone actually dies of "old age" but rather the consequences of old age, one of many possible degenerative diseases. As we get older, the probability of getting many illnesses (some of them fatal) dramatically increases. The higher our age, the more likely we are to develop a degenerative pathology in that particular year. These include, but aren't limited to: dementias (especially Alzheimer's), heart attacks, hypertension, stroke, endogenous depression, osteoarthritis, Parkinson's disease, amyotrophic lateral sclerosis, most of the carcinomas, osteoporosis leading to fractures, hearing loss, presbyopia, and cataracts. Our arteries narrow and harden, our lungs and skin lose their elasticity, we tire much more easily than a 20 year old. If a superbug caused all of those conditions, we would term it a disease.
In 19th century England, 75% of children died of infectious diseases (caused by "bugs") before reaching 10 years old. Now, even in "third world" countries, deaths from degenerative disease now outnumber deaths from infectious diseases.
Some old people are taking 10 different medications a day. The medications are postponing death and reducing the discomfort caused by the symptoms (eg opiates and pain diseases), but they don't cure degenerative diseases. If you stop taking a statin, your cholesterol levels soar into the abnormal range, for instance. Big pharma has a massive financial incentive to focus on symptom relief and suppression rather than curing you permanently. Compare this to syphilis, which was prevalent in 19th century Europe: "A single injection of long-acting Benzathine penicillin G can cure the early stages of syphilis."
OzBargain, what are your thoughs? Feel free to answer if you know nothing about biology, or have just high school biology, or are a medical professional. Death is a topic relevant to all of us. If I have made any mistakes above, calmly correct me.
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