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"Both subjective and objective cognitive impairment are highly common among non-demented elderly Swedes, with an overall prevalence of 39 percent and 25 percent respectively, according to a nationwide twin study by researchers at the Aging Research Center of Karolinska Institutet, Sweden. The study confirms higher education as a major protective factor and stresses the importance of environmental aspects over genes in mild cognitive disorders in old age."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2012-02-cognitive-problems-common-non-demented-elderly.html>