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The study was based on 
 from over 1.1 million people, aged between 10 and 80 years old. The 
 show that our mental processing 
 remains relatively constant until the age of 60, but does start to decline from our 
 decade. The researchers said people's mental processing speed actually increases in their 20s and remains 
 until 60. Dr von Krause said: "Until 
 adulthood, the speed of information 
 in the task we studied barely changed." He added that older people do take longer to make 
, but said this was because we become more 
, and less impulsive and reckless as we age. The study could cast light on neurodegenerative 
 such as Alzheimer's.