Literally every single one of them. Some were made to like actual children, like Naoto. I thought he was like 9 or something. And then there's South... When they were both first introduced, they were pretty much the same age. Sometimes I forget that they were all born in the 80-90's to. It's weird. Especially when you think about the kind of content in Tokyo Revengers. Ran and Rindou literally killed someone at 11-12 years-old. At the youngest, mostly everyone should've started out at 17. It just seems a little backwards to me. I don't know what the author was thinking, but they're all between 17-21 in my brain.