Why are wernicke's aphasia patients older than broca's? a critical view of the hypotheses

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Abstract
As a group, Wernicke's aphasia patients are often reported to be older than Broca's. Various explanations have been proposed for this phenomenon. These include (a) a change in aetiology or locus of lesions across the life span, (b) a lifelong language lateralization process, (c) a selection bias, and (d) cognitive changes associated with normal ageing. A critical review of these hypotheses led to the conclusion that a selection bias and the presence of cognitive changes in ageing were the most reasonable explanations for the mean age difference between Broca's and Wernicke's aphasia patients.