Old age begins at 27 as mental powers start to decline, scientists find @telegraph
The study of 2,000 men and women lasted over seven years. The respondents, aged between 18-60, were asked to solve visual puzzles, recall words and story details and spot patterns in letters and symbols.
Similar tests are often used to diagnose mental disabilities and declines, including dementia.
The research by the University of Virginia found that in nine out of 12 tests the average age at which the top performance was achieved was 22.
The first age at which performance was significantly lower than the peak scores was 27 – for three tests of reasoning, speed of thought and spatial visualisation. Memory was shown to decline from the average age of 37. In the other tests, poorer results were shown by the age of 42.
However, the report published in the academic journal Neurobiology Of Ageing, found that abilities based on accumulated knowledge, such as performance on tests of vocabulary or general information, increased until at the age of 60.
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