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

What is the origin of the proverb "not reveal a man's wage and woman's age" and when to use it?

The origin of the proverb "not reveal a man's wage and a woman's age" is not clearly linked to a specific author or source but is rooted in traditional societal beliefs. It reflects the idea that certain personal details, particularly a man’s salary and a woman’s age, were considered private and potentially problematic if disclosed. The saying suggests that revealing these aspects could lead to judgment or social discomfort. This view is connected to historical gender expectations, where men’s wages were often seen as a measure of their success, and women were pressured to maintain youthful appearances. Today, the proverb is considered outdated, reinforcing gender stereotypes and unnecessary taboos.