TELEGRAPH: Retirement causes brain function to rapidly decline, warn scientists

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Professor Cary Cooper, an expert in organisational psychology at Manchester Business School, said the study confirmed previous research suggesting that if people don’t use it, they lose it.

 “It makes it more likely that dementia will set in earlier,” he said.

"We know the more cognitively active you are the more it offsets the risk of dementia.

“I'm not talking about doing Sudoku but doing something completely different from your job - so if you worked in the civil service all your life, why not go and help out in a hospital or teach?

“The most important thing is to interact with people.”