Previous research demonstrated that perceivers explicitly condemn ingroup members who use racial stereotypes but that they are implicitly more likely to favor those ingroup members rather than ingroup members who do not use racial stereotypes (Castelli et al., 2001). The present study has two main goals. First, we want to investigate whether the same effects can be detected in the domain of ageism. In particular, we predicted that young adults would implicitly but not explicitly favor a young male who describes an old man in a stereotype-consistent way rather than in a stereotype-inconsistent way. Most importantly, we hypothesized that this tendency is related to participants' prejudice level as assessed through an implicit measure (IAT, Greenwald et al., 1998), so that high prejudice individuals will implicitly favor stereotypers and derogate ingroup members who use stereotype-inconsistent information. Results provide general support for the hypotheses, and their implications for stereotype maintenance and change are discussed.