Abstract: Poor bank governance has disastrous consequences for economies as the 2007-2009 financial crisis has shown. In the aftermath, board diversity is identified as an effective mechanism to enhance bank governance (Capital Requirements Directive IV, 2013). Diversity, creating cognitive conflict between board members, is expected to enhance board’s independence of thought to better perform its monitoring and advising functions. Age is a key demographic measure and Chair-CEO age diversity in non-financial firms leads to better economic outcomes (Goergen et al., 2016). In this paper, we examine whether chair-CEO age dissimilarity can be beneficial for controlling and curbing banks excessive risk-taking behaviour, commonly observed in the pre- crisis period. Using a unique sample of the largest 100 listed banks in Europe between 2005 and 2014, we find that age difference between the chair and the CEO reduces bank risk-taking. A chair-CEO generational gap –defined as a minimum of 20 years’ age difference– has a larger impact in reducing risk-taking.