"Is Math a Young Man's Game? No. Not every mathematician is washed up at 30." by Jordan Ellenberg, from Slate in May 2003. I guess that should be "Young Person's Game." Interesting: it now takes such lengthy study to get to the frontiers of your field (and math isn't the only field where this is true, by far), that no one has the chance to be a prodigy until they get into their 30's & 40's.