The list is here, I wonder how young is young, in any case overall a very good set of names. Other than Piketty and Rey, they all teach in the United States. John List is one person I would have added, Jesse Shapiro is another, plus I dare them to try out their judgment on someone who is not at a top ten school and then track how that person does over time.
Who else is missing?
Addendum: the original IMF link is here.