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Use your brain to change your age

7 February 2013 Last updated at 00:41 GMT

Is mental infirmity an inevitable consequence of getting old? Or could we enjoy a more clear-headed old age?

In California it is common to see advertisements promoting brain training or brain workouts which claim to help reverse the effects of ageing.

Bombarded with promises of a longer, healthier life, BBC News Los Angeles correspondent Peter Bowes had his brain scanned to see what changes he should make.