What do Singaporeans call it?

An elderly woman, mother-in-law, is called An Gan.

An old man, uncle

Girls, including young people, Ms. xxx's conservative statement can't be wrong.

Dude, yes, sir.

To be polite, it's better to say sorry, xxxxxxx will be better,

Speak softly, not too loudly. Some of our fellow villagers are so loud that they think they need to find someone to quarrel with, hehe.