It's really striking how many of the top people in different fields are essentially the same today as they were twenty or thirty years ago. Look at politics.

It's really striking how many of the top people in different fields are essentially the same today as they were twenty or thirty years ago. Look at politics. Look at Hollywood. Look, though to a lesser degree, but still markedly more so than in previous eras, at sports. Nobody ages out and opens up their spot anymore. It's a problem when that means the pipeline gets stalled, and causes a lot of problems when the old guard does finally retire or die off, and there are not enough suitable candidates waiting in the wings to pick up, because they have gotten tired of waiting around.