You're right. Here it is:
"Even if we presume that youngsters 15 years of age would be perceptive enough to
realize the import of what happened in 1914, it would still make the youngest of 'this
generation' nearly 70 years old today. So the great majority of the generation to which
Jesus was referring has already passed away in death. The remaining ones are
approaching old age. And remember, Jesus said that the end of this wicked world would
come before the generation passed away in death. This of itself, tells us that the years
left before the foretold end comes cannot be many." - AW 10/8/68 p13-14
"If you assume that 10 is the age at which an event creates a lasting impression on
a person's memory, then there are today more than 13 million Americans who have
a recollection of World War I. And if the wicked system of this world survived until the
turn of the century,which is highly improbable in view of world trends and the fulfillment
of Bible prophecy, there will still be survivors of the World War I generation. However,
the fact that their number is dwindling is one more indication that 'the conclusion of the
system of things' is moving fast towards its end." - WT 10/15/80 p31
"If Jesus used 'generation' in the sense and we apply it to 1914, then the babies of
that generation are now 70 years old or older. And others alive in 1914 are in their
80's or 90's., a few having reached a hundred. There are still many millions of that
generation alive. Some of them 'will by no means pass away until all things occur.'
- Luke 21:32." - WT 5/15/84
"Therefore, in the final fulfillment of Jesus' prophecy today, 'this generation' apparently
refers to the peoples of the earth who see the sign of Christ's presence but fail to
mend their ways."- WT 11/1/95 p19