Interesting that the WBTS that have falsely prophesied time and time again can write of others: 'Their promises and predictions of better things have failed time and again'!
Some seven years later the WBTS realised the problem was growing and emphasised it in this way: "Thus, when it comes to the application in our time, the 'generation' logically would not apply to babies born during World War I" (The Watchtower, 1 October 1978, p31).
Clearly, even a few years later, the WBTS continued to hold out the hope that those who were teenagers during 1914 would see the culmination of all things but, as time went on and the years ticked away, it became obvious to the Governing Body that someone fifteen years old in 1914 would be eighty-five years old in 1984 and the 'generation that will not pass away' was now almost gone by the mid-1980s. The WBTS false prophecy was about to become obvious to the most faithful.
So the WBTS had to admit that they could not go so far as to suggest 'babies' could have seen and remembered anything in 1914! But '10'? Yes, the gullible and the unobservant would accept '10'!
However, once again the WBTS could not admit the false prophesy - so they chose to simply find a way to add more years to the 'generation from 1914' and so, in a 1980 issue of The Watchtower magazine they said of "this generation":
"It is the generation of people who saw the catastrophic events that broke forth in connection with World War I from 1914 onward....If you assume that 10 is the age at which an event creates a lasting impression...." (The Watchtower, 15 October 1980, p31)
Hence, WBTS leaders reduced the age from 15 to 10 in order to allow for five more years for a "generation" that was quickly dying off - and they could now carry on talking about the prophesy as before:
"And the remaining ones of that generation of 1914 are still talking about it. Some of them will be talking about it right down to the time when the 'great tribulation' wipes Satan's wicked system of things off the face of our globe. For Jesus Christ himself assures us: 'Truly I say to you that this generation [the generation that saw the 'beginning of pangs of distress' in 1914] will by no means pass away [completely] until all these things occur. Heaven and earth will pass away, but my words will by no means pass away.' - Matthew 24:3,8,34,35." (The Watchtower, May 1, 1982, p15 - above)
But the 1980 adjustment was only a temporary solution and a further step or two was necessary.
See the title page (next page) of The Watchtower, May 15, 1984 magazine!