Abstract: ObjectiveTo explore age related decline of cognitive ability in aged people in community.MethodsA total of 1 065 non-dementia aged people were recruited from five districts of Taiyuan,China.The cognitive ability and the demographic characteristics of the subjects were investigated.ResultsAge and education were associated with the score of all of the four subtests.Gender was associated with all of the subtests except for digit span.Interaction to the score of cognitive tests was found between age and education.ConclusionAge is a risk factor for cognitive decline which showed its effect particularly after the age of 75.The priority of education decreased after the age of 75,indicating that the protective effect of education to cognition is age-limited.