Why is the word "lady" seemingly prevalent in usage?

In conversation, there is reference to "lady" as in "the lady in the store was very helpful," or "She is a nice lady." It is rare to encounter something like "The gentleman in the store was very helpful." There are also the following terms: Church lady Old lady... show more In conversation, there is reference to "lady" as in "the lady in the store was very helpful," or "She is a nice lady."

It is rare to encounter something like "The gentleman in the store was very helpful."

There are also the following terms:

Church lady
Old lady
Cleaning lady
Ladies' room
Ladies' (clothes) sizes
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