The dotted line at the top is the Jones-implied ratio of productivity of <= 40 year olds to >= 50 year-olds, as drawn from Figure 1 in this source.
For the construction of this data source I am indebted to PseudoMontaigne. Does it not imply that NIH funding is vastly over-allocated according to the criterion of seniority? Or might this be the rise of the lab system, where the older people are the PIs, and they in turn dole this money out to younger researchers? More middlemen, so to speak. Opinions?