Creativity is an important prerequisite for innovation. However, we have found that it is very difficult to be creative. And in retrospect, when you have the solution, the way to get there often seems very simple. Why is that? What prevents us from being creative? If you look at children, they are usually much more creative than adults. Why is that? In this article, various causes for the loss of creativity in elder age are presented and biological mechanisms that dampen creativity are identified. Only if you are aware of these mechanisms, you can consciously circumvent them and thus learn and train creativity again.