But as a relatively early Xer, I can tell you that 20 years ago the cutoff varied between 1963 to 64 to 65. I know this because I had friends I grew up with debating whether they were Boomers or Gen X like me. The years were not so cut and dried back then.
After all, we were named Gen X because we were a mystery. X represented mysteriousness, the unknown. It didn’t represent the antepenultimate letter in the alphabet (which is what those who named Gen Z seem to think X represents). The social scientists developing generation categories at the time didn’t know who we were just like they didn’t know exactly where we started or ended.
All I am saying is that we can claim a person on the cusp if we want to. Just like someone who is maybe a Capricorn and maybe Aquarius can decide what they are. 
Edit history
Recommendations
2 members have recommended this reply (displayed in chronological order):
= new reply since forum marked as read