Then there is no such thing as a generation and no one knows what anyone is talking about.
So far you have got what used to be known as boomers down to a 5 year period, that is meaningless to anyone, so let’s just erase the entire concept. Announce to the world that there is no post war baby boom generation that was measured as those born from 1946 to 1964.
Must you always be so concrete in your thinking?
The English language must be used in proper context.
A biologist knows exactly what the subject is when the term "familial generation" is used.
The behavioral scientist knows perfectly well what the subject is when the terms "cultural generation" or "cultural cohort" is used.
An aeronautical engineer knows perfectly well what the subject is when the terms "First Generation jet fighters" and "Fourth Generation jet fighters" are used.
You insist on treating Landon Jones' pop culture book that described a certain cultural cohort and then slapped it with the dates of a sustained birth rate spike as if that book were a scientific or "formal" study. It was not. Landon Jones' choice of dates had no scientific rhyme or reason whatsoever and are totally invalid as a criteria for defining a cultural cohort.
So far you have got what used to be known as boomers down to a 5 year period, that is meaningless to anyone, so let’s just erase the entire concept. Announce to the world that there is no post war baby boom generation that was measured as those born from 1946 to 1964.
Are you finished comparing your apples and oranges yet?
What does the number of births per 1,000 population above a certain level over a certain length of time have to do with any of the multiple valid scientific definitions of the term "generation"?
Absolutely nothing.
If it were not for the fact that The Pill became widely availble in the early Sixties and abortion became widely available after that, the "Post World War II birth rate boom as compared to pre-World Wa II levels, AKA, The Baby Boom" would still be going on as a result of increased properity in relation to Depression Era America. Then you could claim that every American born in the past 64 year belonged to the same so-called "generation".
What part of "The dates arbitrarily chose by Landon Jones when he wrote the pop culture book had no scientific criteria or rigor or validity whatsoever" are you having a problem understanding?
Landon Jones arbitrarily paired up the birth rate boom between 1946 and 1964 and a recognizable cultural cohort and decided, without any scientific validity, to claim that they are the one and the same.
They are not.
A "population boom" has a specific scientific meaning and such boom, depending on the biological community you are discussing, may last for dozens of "biological generations".
I do not need to announce to the scientific world that:
A. Population booms secondary to extended birth rate spikes
are different from
B. Cultural cohorts
and that both are different from
C. The biological generation time interval in a certain population.
The scientific world already knows that.
You, on the other hand, are still having an awfully hard time understanding the concepts.