I think a lot of us are. My parents are Boomers and we were born between 78 and 82.
Technically being born in 78 makes you GenX. Yet if you have a brother born only 4 years later, it's another generation? We had the exact same experience, Atari 2600 on a TV that is now weird to even think existed. No TV remotes, walk up and change the channel. Rotary phones, city directories and phone books. Need the time and temp? You called the city "time and temp" number. Riding a bicycle to the comic book store and arcade, which were common then. I remember the USSR and my brother and I saw the Challenger blow up on TV at school as if it were 9/11. None of this is the Millennial experience, and they couldn't even describe these details. The world really did change after ~1995, when the internet went mainstream with Win95. Prodigy, CompuServe, AOL, and BBSs were around and used occasionally but I never felt they were significant enough to change society as the internet did post 1995.
In many ways, if you were born from the early 80s back to the 20s you might have had a fairly similar childhood. Stuff that a kid born after the rather dramatic changes the internet caused will never really experience how the world felt different. Similar to how in my grandmother's childhood, she remembers being the first house in the neighborhood to have electricity hooked up. That's a game changer from previous generations.
I think the typical 20 year generational divide is broken with the advent of certain technologies. There has to be a break between those who meaningfully experienced the world prior to the internet and those who don't really remember life without it.