By the age of eight, a new study has shown.
Scientists at University College London (UCL) tested the memory and thinking skills of Britons in their late 60s and 70s and compared the results to similar cognitive tests that they took as schoolchildren in 1954.
They found that someone whose cognitive performance was in the top 25 percent as a child, was likely to remain in the top 25 percent at age 70.
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