The Last Baby Boomers were born in 1964.

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92. Generation Jones are later Boomers/early Xers.

https://en.wikipedia.org/wiki/Generation_Jones
Generation Jones is a term coined by the author Jonathan Pontell to describe those born from approximately 1954 to 1965, while other sources place the start point at 1956 or 1957.This group is essentially the latter half of the baby boomers to the first years of Generation X.

Unlike older baby boomers, most of Generation Jones did not grow up with World War II veterans as fathers, and for them there was no compulsory military service and no defining political cause, as opposition to United States involvement in the Vietnam War had been for older boomers.

The name "Generation Jones" has several connotations, including a large anonymous generation, a "keeping up with the Joneses" competitiveness and the slang word "jones" or "jonesing", meaning a yearning or craving. It is said that Jonesers were given huge expectations as children in the 1960s, and then confronted with a different reality as they came of age during a long period of mass unemployment and when de-industrialization arrived full force in the mid-late 1970s and 1980s, leaving them with a certain unrequited "jonesing" quality for the more prosperous days of the past. ...

The term has enjoyed some currency in political and cultural commentary, including during the 2008 United States presidential election, where Generation Jonesers Barack Obama and Sarah Palin were on presidential tickets.

Gen Jones is somewhat more cynical than the idealistic Boomer generation, but more hopeful and communal than the nihilistic/alienated Gen-X... basically somewhere in the middle.

I agree fully that people have kids at different times, so there is more variance in who are the parents of any given gen, but I still think it would look like a bell curve where Boomers are mainly the parents of X, Gen Jones mainly the parents of Millennials, and X mainly parents of Z, etc.

What clearly defines generations, as you stated, and as Strauss/Howe conclude, is more about the time period the generation came of age and its cultural identity.

Many heros that come to define a generation can be technically not part (in terms of when they were born) of that generation. For example, Jerry Seinfeld is the archetypal Gen-Xer, yet is technically a Boomer or Gen Jones (born in 1954).