That is the funny thing about being around this age. I'm 28, and there was a definite cultural cutoff point with the kids who were 4-5 years younger than me. My siblings are 24 and 25, and even they agree that I am in a different generation than they are. It's bizarre.
I've definitely noticed this as well, in fact I was just listening to a radio segment on it the other day. I'm 27 and those who are two or more years younger than me seem like they are from a different planet. We have little in common culturally. It seems like the cut off is those who were immersed in computers and the Internet before puberty, and those who were introduced to it after. We had some simple computers in elementary school (Oregon Trail!), but our family didn't get Internet until I was 13. So while the Internet dominated my teen years, my childhood at least was relatively computer-free. When I see 3 year olds playing with iPads now it worries me. Not sure why, it just doesn't feel right.
Oh, you kids! There were NO computers or internet when I was growing up. I remember cutting out punchcards in high school once, but that was pretty much the extent of our "computer" education. And I managed to get through college without ever touching a computer as well.
Heck, when I first started working in publishing, back in the early eighties, all of the editors and assistants were still using electric typewriters. I was over thirty before computers and email and the internet started creeping into editorial offices . . ..
So, yeah, there's a definite chasm between folks who grew up with computers and those of us who are struggling to keep up with all this ever-changing technology.
(My college-age niece was horrified a few years back to discover that I had never texted anyone in my life! It was as though I had admitted to not knowing about fire or the wheel.)