Yves here. I have to confess that I had no idea that the average age of CEOs had risen in nearly all countries and in companies both small and large. This article does a fine job of documenting the phenomenon but is not as good on possible explanations. Readers may do better than their and my ideas. One could be less ageism in upper class cohorts, particularly in light of improved health among the aged and plastic surgery. Second could be the great shift rightward across the world, that more conservatism makes leadership by elders and less turnover at the top more attractive. By Valentin Kecht, PhD Student Universität Bonn; Alessandro Lizzeri, Professor of Economics Princeton University; and Farzad Saidi, Professor Universität Bonn. Originally published at VoxEU The composition of Western workforces has shifted toward older workers, and this trend is particularly strong at the very top of business organisations.…