This is the thesis of David Galenson's "Old Masters and Young Geniuses", which is a good read. He also talks about how trying to find a single average age of p

This is the thesis of David Galenson's "Old Masters and Young Geniuses", which is a good read. He also talks about how trying to find a single average age of peak creativity hides other possibilities, such as the one he suggests, where there are clusters among the young (conceptual innovations) and old (experimental innovations).