I found this below:
At the 2010 annual meeting, John Barr presented the latest understanding of the generation. 97 year old Barr was an apt choice to deliver this talk, being the last of the Governing Body born before 1914. He explained the generation is now to include 2 groups whose lives "overlap" since 1914:
- "John Barr ... twice read the comment: "Jesus evidently meant that the lives of the anointed ones who were on hand when the sign began to be evident in 1914 would overlap with the lives of the other anointed ones who would see the start of the great tribulation." We do not know the exact length of "this generation," but it includes these two groups whose lives overlap. Even though the anointed vary in age, those in the two groups constituting the generation are contemporaries during the part of the last days. How comforting it is to know that the younger anointed contemporaries of those older anointed ones who discerned the sign when it became evident beginning in 1914 will not die off before the great tribulation starts!" Watchtower 2010 June 15 p.5
I'm guessing it's of a younger group of anointed who came in later.........he also states: "the generation are contemporaries" during the part of the last days, maybe meaning.....they are contemporaries NOT in age.....but within.... "this generation" which they don't know the exact length....