Nobody forgot about Gen X. It is just easier to lump Gen X into whatever generation that you dislike. If you are a boomer, Gen X is still part of the generation of young people. You just ignore their bad backs and creaky knees.

If you are younger than Gen X, you can call them boomers because they often suffer the problems of aging. Aka looking old. It is why some people complained about Kamala picking Tim Walz as her running mate as he looked older than her. He is just six months older.