Lots has changed. Twitter wasn't much in 2009. Lady Gaga came and went. The economy has improved. Skinny jeans were really just coming in full force in 2009... now they're probably headed out. The undercut has saturated its way into mainstream.
The real answer is: You're getting old, Naso. My parents were born in the late 50s and my mom could never tell the big difference between the late 70s into the 80s. She'd say "I was too busy having kids and raising them in the 80s to follow pop culture."
It's the way life goes. I think what is interesting about you is this perpetual surprise at the normal way of things... as if you're the first person to experience it. I bet you think kids look younger now than they did back in "your day".... .....
I don't think it has to do with age as my mom notices it and I'm a "millennial" and I notice it.
It isn't that there has been no change, it is that there is no major style difference.
Like say a photo of high school students was taken in the 50s, 60s, 70s, 80s, 90s, 00s, and 10s.
I think the 00s and 10s would be pretty much indistinguishable, while the other eras each would be. And it isn't just image, the style of music changed. It isn't about one singer losing popularity but a major difference of style.
