Thanks to a number of notices about a website titled www.jwfacts.com, I took a quick tour and found some very informative pages and charts about the organization's positions and history. Thanks also to a number of posters for their reminders.
I can't summarize the whole site in a topic, but it did include a history of the interpretation of the phrase "this generation", appearing in Matthew 24:34.
"Truly I say to you that this generation will by no means pass away until all these things occur."
Interpretation of this verse in the history of the JW organization, as the site notes, seems to have had six generations of revision. So far. Perhaps because the Revisers are getting closer and closer to the light.
It was C. T. Russell that had dismissed the notion that the Greek word genea had anything to do with tribe or race, but in initial search I did see some suggestions that a full list of genea dictionary definitions could include that. Then that would make the resolution of events prophesied in the 24th chapter an open-ended proposition. But that wouldn't solve the society's problem either.
Still, based on that outside assertion I just thought I'd look around using a Concordance of the Greek text... And what did I find?
Matthew in the first chapter of his book gives a very clear definition of how long a generation lasts! He provides three examples. He uses the word "genea" and connects it with historical events! Matthew 1:17
"So all the generations from Abraham to David [are] fourteen generations; and from David until the carrying away into Babylon, fourteen generations; and from the carrying away into Babylon unto Christ, fourteen generations."
I am sure, what with the Society's fascination with "sacred" numbers such as multiples of seven, someone must have stumbled on this verse now and them. I have probably missed out on lots of internal discussion of this over the years, though I was previously aware that Luke had found several more generations to add to this geneaology. But we rest assured that both genealogies are correct, right? If not, that's another topic. But the important thing in this context, is that we have the author of chapter 24 going on record in the same book as to what he thought a generation entailed. Moreover, he defined it in terms of the society's own gold bar measure for events: along that timeline between the fall of Jerusalem and 1914! You might say that Jerusalem fell in 587 or 607 BC or that Jesus was born in year 1 AD or 4 BC, but fourteen generations strung between those error margins is not going to change a definition of a generation by a decade.
Are we ready for some trial calculations?
607 / 14 = 43.3 years. 587/14 = 41.9 years
We could get longer if we dropped a generation.
607/13 = 46.7 years 587/13 = 45.1 years.
Shorter if we added, but why bother.
Although Matthew is less explicit about when King David reigned, between five and six centuries earlier is not a bad guess. Archaelogical connections with Egyptian kings and the book of Kings itself tie down Solomon fairly well, if not David (circa 1000 BC). Between David and Abraham, we've got less tie in from other records and much controversy, but patriarchs aren't surving as many years as they used to according to the Bible. Also, we can see from the usage that it is not a question of how long an individual survived, but what was the space of time netweem the ascendancy of one generation after another. If he's a 18th century figure, then a generation is about 53 years. If he is a 23rd century figure, then it might be 85. But what do you base Abraham's existence on in either century or millenium? And there goes the imposed symmetry of Matthew's genealogical argument.
What comes to mind at moments like this is Moliere's play "the Bourgeoise Gentleman". As Monsieur Jourdain is being schooled for society, the distinction between prose and poetry is provided by his instructor. The student exclaims, "I had been speaking prose all my life and didn't even know it!"
In Bible study under supervision, while speaking of generations, does anyone ever bring anything like this up?