Firstly, "the term 'generation' as used by Jesus [at Matthew 24:34] refers principally to contemporary people of a certain historical period, with their identifying characteristics." (wt95 11/1, p. 17, ¶6) Secondly, Jesus compared the generation in his day to the one in Noah's day at [Matthew 24:37-39], it seems clear that the people in Noah's generation paralleled the people in "this generation" which began when the sign of Jesus' second coming became manifest in the year 1914. (I would take note the use of the word "this generation" as they are used at Genesis 7:1.] Thirdly, even if we should be able to determine when "this generation" began, we would still be unable to calculate when "this generation" would come to an end since no one knows the "day and hour."
Having said this, should we give consideration to what Exodus 1:6 says regarding the death of Joseph, Jacob's/Israel's son, "and also all his brothers and all that generation," then based on how old Joseph was when he died -- 110 -- then his contemporaries would have been "all [of] his brothers and Joseph's two sons, Manasseh and Ephraim, who were both living when their father died. Now looking at the dates, Jacob at age 84 marries both Leah and Rachel in 1774 BC (after his uncle Laban does a bait and switch) so that his 11th son, Joseph, is finally born to Rachel in 1767 BC. (Rachel dies when Benjamin, Jacob's most beloved son, is born some six years later in 1761 BC.) Those of Jesus' spiritual "brothers" that were alive contemporaneous to the "sign" in 1914 would correspond to Joseph's birth and Joseph's two sons that were alive when Joseph died would also have been contemporaries of Joseph.
Since the separation of sheep from goats doesn't begin until "immediately after" the great tribulation (Matthew 24:29), and Jesus specifically stated at Matthew 24:34 'this generation would not pass away until all these things [that Jesus mentions in Matthew 24 and 25] have occurred,' including the tribulation, then it would seem that just as Joseph's contemporaries were still living when Joseph died, then some of Jesus spiritual brothers would still be alive after the tribulation.
The fact that our current year of 2010 is 96 years removed from the year 1914 does not help one do any more than speculate as to the year when the end will come, for we arrive at the year 2024 when counting 110 years forward from 1914 and the Bible is silent as to when Manasseh and Ephraim, who were born in Egypt, but were contemporaries of their father, died.
Now trying to prove Jesus' wrong when he indicated that no man knows "that day or the hour" is such a ridiculous exercise as trying the calculate the year when "the end will come," but it'll come when the good news will have been [satisfactorily] preached in all the earth, which is something that Jesus also said (Matthew 24:14), for if Jesus did know 'the day or hour' when he said this, why would he have lied?
Berating spiritual-minded members of the GB or other Christians for doing what they can to encourage Christians to stay awake and keep them from going to sleep when they need to be vigilant with a view to prayer is evidently the preoccupation of some, but remember just as the Law appointed men having weakness as high priests (Hebrews 7:28), Jehovah uses men today that are just as imperfect, who may at times have gotten it wrong and might even have said some zany things they we might wish they did not say. But most of us here know more of what things the Bible teaches that most the truth because of the work of such dedicated "men," both past and present, including Jesus, including Paul, that have been doing their best to 'keep watch over our souls.' (Hebrews 13:17)
