Meaning of the word "not reveal a man's wage and (a) woman's age" in English

What does "not reveal a man's wage and (a) woman's age" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

not reveal a man's wage and (a) woman's age

US /nɑt rɪˈvil ə mænz weɪdʒ ænd ə ˈwʊmənz eɪdʒ/
UK /nɒt rɪˈviːl ə mænz weɪdʒ ænd ə ˈwʊmənz eɪdʒ/
"not reveal a man's wage and (a) woman's age" picture

Idiom

a social rule suggesting that it is impolite to ask or disclose a man's salary or a woman's age

Example:
In many cultures, people follow the rule to not reveal a man's wage and a woman's age to avoid awkwardness.
Remember the old etiquette: never reveal a man's wage and a woman's age.