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Funny how the definition of "generation" changes every time it's necessary to change it.
In 1970, they were telling everyone that the end would come in 1973 because a generation was 25 years. After 1973, they were saying the end would come in 1978 because everyone knows that a generation is 30 years. There wasn't much noise about 35 years, but several famous books were written based on the idea that of course everyone knows that a generation was 40 years and the end would come in 1988. Then it was 50 years, then 60 years. Every time, a new crop of gullible believers who don't remember all the other predictions take it seriously and think the definition of generation is whatever the scare mongers decided it was this time.
I can't tell you how many self-serving definitions of "generation" I've read made up by people desperate to explain the fact that the world has not ended yet. Sometimes they say a generation is an "age," or a "race," or any number of other things.
Anyone who is paying attention to the constantly changing stories just laughs.