New research finds that humans do not simply die of old age, with the majority of elderly deaths being caused by cardiovascular problems.
The phrase “died of old age” may sound comforting, but a growing body of scientific evidence suggests it is misleading. According to a new review in the journal Genomic Psychiatry, aging itself does not directly cause death. Instead, people die due to specific biological faultssuch as heart attacks, strokes or organ failure, which become more likely with advancing age.
The review, led by researchers Maryam Keshavarz and Dan Ehninger of the German Center for Neurodegenerative Diseases, analyzed decades of autopsy data on humans and animals. The conclusion is clear: aging increases vulnerability, but is not the final cause of death.
In humans, the cardiovascular diseases predominate overwhelmingly. Autopsy studies show that heart attacks, strokes and cardiopulmonary failure are responsible for most deaths, especially in the elderly.
An analysis of people over the age of 85 who died suddenly outside of hospital found that approximately three quarters of deaths were caused by cardiac events. Even centenarians who appeared healthy just before they died did not succumb to aging itself. Instead, a specific organ system failed in a measurable way.
Analyzing different species, the pattern remains, although weaknesses vary. Mice, rats and dogs die more often from cancer. Fruit flies usually die when the lining of their intestine ruptures, while certain worms die after losing the ability to swallow. Each species has a biological “Achilles heel” that eventually gives way. Aging increases the probability of failure, but something concrete deals the fatal blow, says .
This distinction has important implications for how aging research is approached. Interventions such as rapamycin or intermittent fasting can prolong the lives of laboratory animals, but mainly by delaying the onset of diseases that often kill them. Animals still die from the same causes, just later. This, the authors argue, is not the same as delaying or reversing aging itself.
Ultimately, the researchers argue that aging should be understood not as a cause of death, but as a condition that increases the likelihood of death. specific and identifiable failures. If science hopes to significantly extend human life, they conclude, the focus may need to shift from fighting aging itself to preventing the specific diseases that actually end it.
