It's interesting for me as I'm Serbian but grew up in Indonesia. In Serbian we very much have honorifics (I think honorifics is the wrong word, not sure what the correct one is) and rules like "Younger always addresses the older with vi instead of ti, and vama instead of tebi etc. unless you're relatives or are close", but it also applies generally for strangers, so even if you're the same age or even if you're older, it's more polite to use the formal forms.

In Indonesia nobody really cares too much, and I called my teachers everything from "Ibu X" (Ibu meaning ma'am/miss, but also mother) to their first names or a mixture like "Ibu FirstOrLastName". At best you'll get a "bapak/ibu" which is basically just sir/ma'am, but I've been called "kak" (lit. translated it's something like "little sister/brother", it's a very asian concept and a lot of cultures have the same, like oniichan).

I always struggle when I go back to Serbia, 'cause I wasn't really brought up with the importance of honorifics. It feels weird when I get a kid using honorifics with me, feels like I'm 60 (I'm in my 20s), and likewise people look at me like I just spat in their face if I don't use the honorifics sometimes.

Language is truly fascinating!