(Warning! This is going to be a long post, some will probably find it boring and skip it.)
I don't know about the US or the rest of the world. But where I live? No, I don't think so. When I was a kid/teenager, I was probably the only one in class who read comics. In twelve years I have probably seen only one kid holding a comic book. I wanted to give him a high five
We have two "big" comics to choose from where I live. Donald Duck and The Phantom (you know, the first "superhero" in comics), and they're sold in regular grocery stores (we do have some comic book shops here and there, but it's cheaper to buy online, and much more to choose from).
When I was younger there was Batman, Superman, Spider-Man and so on, but they have never been as popular as Donald Duck and The Phantom. Spider-Man must be the most popular American comic over here, he had many issues published in my language before he disappeared from the stores.
I remember when "Batman" came out in 1994. It was a magazine with stories from "Batman Adventures", based on the animated series, an adaptation of "Mask of the Phantasm" and the Harley Quinn story "Mad Love". It was the coolest thing ever, in the middle of the magazine there was a feature called "The Gotham Gazette", with the history of Batman comics, movies, news about Batman Forever etc. I was 7 years old, and it was my favorite comic... It lasted only 12 issues before it vanished because of low sales
Maybe I'll upload some pics of the magazine, just to show you how cool it was
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Anyway... It seems that most of our comic book readers are men in the middle of their 30s and older. Even my grand-uncle read comics until his death, and he was 95 years old or something.
It's really sad that so many kids miss out the fun. Or maybe that's the problem. There is no fun... Most comics today are incredibly dark, violent and sexual. I'm not saying that comics should ONLY be for kids, but mainly for kids. As I wrote in another thread; if I were a kid today, and picked up a Batman comic, I would probably be scared away from reading comics!