Redvip2000 - you may be onto something. Perhaps a cryo facility will accept a JW and it can be said that the person is not truly dead but in stasis. You cracked it !!!
The overlapping generation teaching is so nutty (and unscriptural) that I am still amazed that anyone sound in mind would consider it a serious teaching.
In 1994, WTC was backed into a corner on the generation teaching and needed a filler teaching until they could wind the old one down and out of memory. Eventually they settled on the Overlapping Generation teaching after many whiteboard/dartboard sessions.
The Bible is not ambiguous. Matthew 1:17 says "So all the generations from Abraham to David were fourteen generations, and from David to the deportation to Babylon fourteen generations, and from the deportation to Babylon to the Christ fourteen generations."
That is 42 generations. Abraham was thought to have been born around 2056 - 1996 BC. (Estimates vary so lets take the earliest to get the greatest years why don't we)
2056 years divided by 42 generations equals 48.9 years. This would be an average that one could use as supported by the Bible.
Of course generations do overlap (since fathers don't die as soon as their sons are born) but the Bible never mentions that as a consideration for determining the meaning of Jesus words.
Jesus prophesied in 33 CE - the Jewish system of his day ended in 70 CE - well within the lifetime of the generation he spoke to - only 37 years. You may not believe he existed and prophesied, but WTC does.
Any attempts to twist the meaning is to support an unscriptural narrative.
The generation of 1914 passed away long ago. Are there individuals alive who are at least 109 years old? A small number - yes. But in no way does a small group of elderly ones represent an entire generation. Some refer to them as outliers. Understanding Jesus words require intellectual honesty - something that WTC lacks in large degree.