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An experiment examined the hypothesis that elderly people rely on stereotypes more, and are more prejudiced, than younger people because of deficits in the ability to inhibit information. Consistent with predictions, elderly people relied on stereotypes even when instructed not to, whereas young people did not. Elderly people also were more prejudiced than young people, and these differences in stereotyping and prejudice were mediated by age differences in inhibitory ability. Because elderly people reported a stronger desire than young people to control their prejudiced reactions, these results suggest that inhibitory failure can cause people to become more prejudiced than they want to be.
Hippel et al. (Mon,) studied this question.