Rudolf Steiner: "People who do not take up anything spiritual remain 27 years old even if they live to be 100. It means they have the characteristics of 27-year-olds. And with people refusing to look for inner spiritual impulses, we now have a culture and a social life that is 27 years of age. We do not grow beyond the age of 27 in our outer social life. This age now rules humanity."
Source: September 30, 1917