Someone please explain whats up with all the characters in mangas who say they're old in t...

People in real life are like that too. It can just be a way of comparing yourself to someone younger than you I guess (I wouldn't know since I'm not 20)

but...It's still shocking when you have in mind that in Japan 20 is minimum age for drinking alcohol...It's absurd to see charcters in mangas calling themselves old at 25, like, dude hold on you only became legal just few years ago (￣∇￣")