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.