This article is unavailable. David Bunce, Maya Tzur, Anusha Ramchurn, Felicity Gain, and Frank W. Bond. Mental health and cognitive function in adults aged 18 to 92 years. Journal of Gerontology: Psychological Sciences, 63B, P67-P74 (2008). If you wish to obtain a copy please contact the author below: david.bunce@brunel.ac.uk