> The younger person also addresses the older person, usually with a title or another word that fits their relationship, but not their name. Only the older person addresses the younger one with their name. (There can be more nuance.) I love this. I'm an old French guy and still can't quite accept when srangers in an email (or a machine, a system, a web form) adress me using my first name. Being "on a first name basis…
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…
The problem is, if you say "usted" to someone who doesn't see themselves as old, they might take offence. So, trying to be polite in Uruguay can backfire if your mental age calculation is off!