Linking top management team age heterogeneity to firm performance: juxtaposing two mid-range theories

Previous research on top management team heterogeneity and firm performance has focused almost exclusively on the non-visible attributes (e.g. functional background, tenure) of cultural diversity as opposed to the visible attributes (e.g. age, race and gender). The few studies there are show inconsistent results. For example, most field work - consistent with social identity theory notions - shows that cultural diversity, in isolation has negative organizational consequences. Only a few laboratory studies, however - consistent with information and decision-making theories - show that diversity in groups relates to favourable organizational outcomes. As social identity theory suggests, we find that top management team (TMT) age heterogeneity, in isolation, relates negatively to return on assets. On sales growth (i.e. organizational growth), the relationship is positive, lending support for information and decision-making theories. However, we find a curvilinear relationship between TMT age heterogeneity and sales growth, supporting both the mid-range theories. More specifically, TMT age heterogeneity is positively related to sales growth at low and medium levels and negatively related to sales growth at high levels. In addition, results reveal that context moderates linear and non-linear relationships. The results provide evidence of the importance of cultural diversity in TMTs for competitive advantage but also suggest the complexities of increasing it to observe these benefits.