This is the easiest way i have found to remember it, AND to blow it up simultaneously and accurately. I am not sure what Fred Franz has to do with this specifically so I would refrain from using names.
If someone was old enough to partake in 1914, that is the first part of this generation. If someone in modern times was old enough to partake with people from the first group, they are an extension of that group (they overlap with it).
The WT has said the end will come before all these ones pass away.
So......one need simply find the youngest member of the anointed that was alive and partaking while someone who partook in 1914 was still alive (so not necessarily the youngest anointed person out there), and figure out how long they will probably live to get an expiration date on "this ole system of things".
This is exactly what is taught by JW's currently without any hyperbole or stretching of imagination.
Its like shooting fish in a barrel.