I can show you crap on the internet that says Gen-X starts in 1966 and even 1967.
General consensus is somewhere between 1962-1964 and ending around 1980.
Yes, you can find all kinds of”crap” on the internet, a vast collection of various individual definitions and niche definitions, if there is no definition, then there is no discussion, you are right about Gen X though, it isn’t well defined yet, but boomer is.
As you can see, the most accepted definition of boomer is the government’s, 1946-1964, it is the one used in all real discussion of the generation by the census bureau, congress, the GAO, and the large elements of the private sector that need to use a definition that agrees with all of the massive governmental agencies and policies, and research and data collection, Gen X seems to be less pinned down, but boomers are very well defined.