Ageism is one of the most common forms of discrimination yet quite distinct from the other forms of discrimination. Contrary to the relative stability of group membership in different groups, members of one age group will naturally become members of another age group through natural aging process, eventually becoming the elderly „others“. The aim of this study was to determine predictivity of sociodemographic variables, Big Five personality traits and the dimensions of individualism and collectivism for ageism. The study was conducted on a sample of 533 participants ranging from 18 to 74 years old (M = 32.41, SD = 10.7, 75.4% women). The criterion variables were modern racism (1), stereotype content (warmth (2) and competence (3)) and beliefs about ageism (4) (positive personality (5) and the social role (6) of the elderly). Study results show that the sex of the participants is predictive for all measures of ageism (with men more likely to discriminate). Participants' age is positively predicitve for modern racism and stereotype warmth, but negatively predictive for beliefs about the elderly and their social position. Importance of faith in life is positively predictive for modern racism. Among personality traits, agreeableness is a negative predictor of all measures of ageism, conscientiousness is a negative predictor of stereotype warmth and competence, and openess is a negative predictor of stereotype competence and beliefs about the elderly. Horizontal collectivism is a positive predictor of stereotype competence, while vertical individualism is a positive predictor of the beliefs about the elderly and their positive personality. Findings indicate that the best predictors of ageism are personality traits, especially of the stereotype content about the elderly.