Susan, I agree w/your idea that '54 is too early to be a "Joneser." One of my aunts is a '54 cohort & she's *definitely* not a 13er in any way.
FWIW, based on my observations I would push the Boomer/13er boundary the other way--to '61 or even '62. At my high school, the class of '80 was considered golden. *Everyone* was smart, *everyone* did something athletic (& pretty well, too--except in football), & *everyone* was a "good kid," like a Happy Days character. My class was continually weighed in the balance & found wanting. My French teacher went into labor early at the end of the year & we said that it was the shock of having, for the first time, some of her students fail the Regents exam.
I also have wondered about the 13er/Millenial boundary. One of my cousins is an '82 & the prototypical Millie; another is an '84 & much more like an Xer. And I'm curious as to when exactly the Millie/Next Adaptive boundary will be set. If 9/11 is really the start of the next Crisis, then will the children born '97-'98 (my daughter's a '98) & later be part of the Adaptive generation? S&H say that the first years of a generation are born before a turning... What do y'all think?
"The rich are very different from you and me." --F. Scott Fitzgerald
"Yes, they have more money." --Ernest Hemingway