Duke University is a private research university in Durham, North Carolina. Founded by Methodists and Quakers in the present-day town of Trinity in 1838, the school moved to Durham in 1892.
How quickly people go in your 40s, is a sign of how much their brains and their bodies, are older, have proposed scientists.
With a simple test of the speed, the researchers were able to measure the aging process.
Not only slower hikers' bodies were aging Faster - their faces looked older and had smaller brains.
The International team, said the results were a "great surprise".
the Doctors measure to measure the speed, the General health, and in particular the over 65-year-old, because it is a good indicator of muscle strength, lung function, balance, spine, strength and vision.
Slower walking speeds in Old Age is also associated with a higher risk of dementia and decay.'report a Problem'
The participants in the study also had physical tests, brain function tests and brain-scans, and during their childhood they had cognitive testing every few years.
"This study found that a slow walk is a problem, decades before the age," said Prof Terrie E Moffitt, lead author from King's College London and Duke University in the USA.
Even at the age of 45 years, there was a large variation in speeds with the fastest at about 2m/s at the highest speed (without running).
In General, the slower hikers rather a sign of "accelerated aging" with your lungs, teeth, and immune system in a worse state than those who walked Faster .researchers studied the walking speed of the participants on an 8m-long pad
was The unexpected result is that the brain scans showed the slower hikers looking brains were more likely to be older.
And the researchers found they were able to predict the walking speed of the 45-year-olds with the results of intelligence, language, and motor skills tests when they were three.
write to The International team of researchers, said the differences in health and IQ could be due to life style or a mirror image of some people with a better health at the beginning of life.
But you suggest there are already signs in the early life, who will fare better, in terms of health in later life.
The researchers said the measurement of the step speed at a younger age could be a way to test the treatments to slow down the aging process of people.
A Number of applications, from low-calorie diets, the intake of the drug metformin are currently under investigation.
It is also an indicator for the early brain and body health, so that people can style changes to your life, while they are Still Young and healthy, the researchers said.