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Neurobiol Aging. 2009 Apr;30(4):521-4; discussion 530-3. doi: 10.1016/j.neurobiolaging.2008.11.013.

Challenging the notion of an early-onset of cognitive decline.

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  • 1Department of Psychology, Stockholm University, Sweden.


Salthouse claims that cognitive aging starts around 20 years of age. The basis for this claim is cross-sectional data. He dismisses longitudinal data, which typically show the cognitive decline to start much later, around 60 years of age. He states that longitudinal data cannot be trusted because they are flawed. There is a confounding between the effects of maturation and retest effects. We challenge Salthouse's strong claim on four accounts.

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