“…While some investigations suggest that sex differences remain largely constant up to old age (Herlitz et al, 1997;Larrabee and Crook, 1993), others concluded that sex differences disappear at older age (Dollinger, 1995;Herman and Bruce, 1983;Robert and Tanguay, 1990). Also, there are reports suggesting that the typical age-related cognitive decline is greater in men than in women (Barrett-Connor and Kritz-Silverstein, 1999;Elias et al, 1997;Van Exel et al, 2001), or the opposite (Brayne et al, 1995;Elias and Kinsbourne, 1974;Meinz and Salthouse, 1998), or equal in the two sexes (Barnes et al, 2003;Maitland et al, 2000;Singer et al, 2003). Maylor et al (2007) tested a large sample of subjects (almost 200,000) with various tasks, and found a generally steeper age-related decline in response accuracy for males than females, while the opposite was found for response speed.…”