> Professional mathematicians peak in their 20s, just after they stop solving "shallow" questions, and start poring over "deep" ones. This is a ridiculous myth

> Professional mathematicians peak in their 20s, just after they stop solving "shallow" questions, and start poring over "deep" ones. This is a ridiculous myth. As a truism, person's creative intellectual output is greatest when they are working hardest and have the greatest number of tools of creation available to them. I could go down a long list of mathematicians (famous and not famous) whose most influential work was done later in their careers.