I have been doing mathematics up until a couple of postdocs - and based on first hand experience I think that the story of young mathematicians is mostly a myth

I have been doing mathematics up until a couple of postdocs - and based on first hand experience I think that the story of young mathematicians is mostly a myth. Maybe people in their 60s were not at the center of research, but I would say that the field was dominated by people in their 40s (certainly not by 20-something). I cited the Fields medal, because their artificial limitation on age is one of the first things that comes to mind when talking about the subject