The decline of creativity is what psychologists refer to as ‘inculturation.’ That as we get older, as we get tenure in a field, we become invested in the status quo. We develop habitual ways of thinking, routines, we develop customs in terms of how we solve problems. Those make our lives a little bit easier, they make it easier to apply for grants. They make our days a little more efficient but they also make it harder to think outside the box.
— Jonah Lehrer on aging and creativity.