These are the only two parts that mention the overlapping generations.
Watchtower April 15, 2010 p.10
13 Third, holy spirit is at work in bringing Bible truths to light. (Prov. 4:18) This magazine has long been used by “the faithful and discreet slave” as the primary channel for dispensing increased light. (Matt. 24:45) For example, consider our understanding of those who make up “this generation” mentioned by Jesus. (Read Matthew 24:32-34.) To what generation did Jesus refer? The article “Christ’s Presence—What Does It Mean to You?” explained that Jesus was referring, not to the wicked, but to his disciples, who were soon to be anointed with holy spirit.* Jesus’ anointed followers, both in the first century and in our day, would be the ones who would not only see the sign but also discern its meaning—that Jesus “is near at the doors.”
14 What does this explanation mean to us? Although we cannot measure the exact length of “this generation,” we do well to keep in mind several things about the word “generation”: It usually refers to people of varying ages whose lives overlap during a particular time period; it is not excessively long; and it has an end. (Ex. 1:6) How, then, are we to understand Jesus’ words about “this generation”? He evidently meant that the lives of the anointed who were on hand when the sign began to become evident in 1914 would overlap with the lives of other anointed ones who would see the start of the great tribulation. That generation had a beginning, and it surely will have an end.
Watchtower January 15, 2014 p.30, 31
THIS GENERATION WILL NOT PASS AWAY
14 There is yet a third reason for confidence. What has developed among God’s people points to the nearness of the end. For example, prior to the estab- lishment of God’s Kingdom in heaven, a group of faithful anointed ones were actively serving God. When some of their expectations about what would happen in 1914 did not come about, what did they do? Most of them proved their integrity under trials and persecution and kept right on serving Jehovah. Over the years, most—if not all—of those anointed ones have faithfully completed their earthly course.
15 In his detailed prophecy about the conclusion of this system of things, Jesus said: “This generation will by no means pass away until all these things happen.” (Read Matthew 24:33-35.) We understand that in mentioning “this generation,” Jesus was referring to two groups of anointed Christians. The first group was on hand in 1914, and they readily discerned the sign of Christ’s presence in that year. Those who made up this group were not merely alive in 1914, but they were spirit-anointed as sons of God in or before that year. —Rom. 8:14-17.
16 The second group included in “this generation” are anointed contemporaries of the first group. They were not simply alive during the lifetime of those in the first group, but they were anointed with holy spirit during the time that those of the first group were still on earth. Thus, not every anointed person today is included in “this generation” of whom Jesus spoke. Today, those in this second group are themselves advancing in years. Yet, Jesus’ words at Matthew 24:34 give us confidence that at least some of “this generation will by no means pass away” before seeing the start of the great tribulation. This should add to our conviction that little time remains before the King of God’s Kingdom acts to destroy the wicked and usher in a righteous new world.—2 Pet. 3:13.
