"Get the proof of his age, Joe".
Insert the 4 bold words into alphametic equations:
in such an order that there will be a unique set of non-zero
digits (each distinct letter representing a distinct digit) fitting as a solution.
Which digits represent the nine letters a,e, ...t?
REM: I've built this puzzle bottom-up, so there might be solutions different
from mine - unlikely, but always welcome.