In western cultures, women with gray hair are often described as being "over the hill" while men with gray hair are referred to as "distinguished." the reality that women are judged more harshly than men relative to appearance is referred to as a

In Western cultures, women with gray hair are often described as being "over the hill" while men with gray hair are referred to as "distinguished." The reality that women are judged more harshly than men relative to appearance is referred to as a double standard.

Explanation:

A double standard is a rule, norm  or principle which is unfairly applied in different manners to different people or groups.

this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.