I don't know how they can change a generation from 20 to 80 years when if I was with my mam and daughter we'd say we were 3 generation's.
JrJW you got it in one. Watchtower would say you were one " overlapping" generation. And so with that they can say the generation that saw 1914 could still be around in 2060, say. You are going to have to carry to torch for us as we will all be gone when that year rolls around so we need you to remind everyone what they said back in this time!