New Research: Taking it Easy as we Grow Old Gracefully is ALL WRONG!

A study out of Harvard University has researchers argue we aren't meant to reduce our physical activity as we age at all.

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In the modern western world, people tend to reduce their levels of physical activity as they get older.
But with this inactivity comes a raft of adverse health effects, so why didn't evolution engineer us in a way that allows people to maintain a decent quality of life as they inevitably slow down? In effect a longer Healthspan. In a new paper, published in the Proceedings of the National Academy of Sciences, researchers argue it is because we aren't meant to reduce our physical activity AT ALL as we age. And as a result the 'Active Grandparent Hypothesis' was born.
Researchers have started to uncover the beneficial processes that physical activity helps to promote, such as maintaining a lower blood pressure and reducing systemic inflammation.
But it remains unclear why these mechanisms cease to operate to the same degree in the absence of physical activity, especially in older people, who rely on them to maintain their health and quality of life.
In the paper, lead author Daniel E. Liberman of Harvard University, adopts an evolutionary approach where he draws on previous biomedical findings to explain why physical activity reduces illness and injury, and more importantly extends longevity.
In the past evolutionary biologists have tended to argue that since only recent human generations have been able to put their feet up in their twilight years, evolution just hasn’t had the time to catch up.
This might explain why we should take note of our ancestral habits and stay physically active as we age, but it doesn't tell us why our ancestors managed to stay active for so many of their 'retirement' years.
In laying out their evolutionary explanations, the authors break down some of the assumptions we have about ancient humans.
The authors of the paper stated that "Contrary to the widespread belief that human life-spans until recently were short, hunter-gatherers who survive infancy and childhood tend to live on average seven decades, approximately 20 years past the age at which they cease reproducing, and fossil evidence indicates that extended human lifespans were common by 40,000 years ago." Older individuals in social groups were not only selected by evolution for longevity because they could impart important knowledge and skills, but because they could still also physically forage and contribute to the families food supplies, especially for their children and grandchildren.
The authors noted that "While the number of daily steps older Americans take decreases by about half between the ages of 40 and 70, daily walking distances among hunter-gatherers such as the Hadza decline only modestly with age."
Dr. Daniel E Lieberman, Professor of Human Evolutionary Biology at Harvard University Said "The key take-home point is that because we evolved to be active throughout our lives, our bodies need physical activity to age well. In the past, daily physical activity was necessary in order to survive, but today we have to choose to exercise, that is, do voluntary physical activity for the sake of health and fitness."
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