You use this phrase to mean something that has been in existence for a very long time. You might say "I've lived here for ages," or "That book has been checked out of the library for ages." Sometimes, "ages" is a literal term, meaning decades or generations, such as houses or monuments which have "been here for ages." Other times, it is an exaggeration, such as "I've been waiting in line for ages."
It takes a long time to do an important job
It is the ancient times before the Middle Ages.
when you were in diapers when you were in short pants
to take its origin or rise; begin; start; arise: The practice originated during the Middle Ages
Who was the leader of the dark ages
RFP is not an idiom. It's an abbreviation.
It's not really an idiom. It means "what are you thinking about."
It is not an idiom, it means your nose is itching.
idiom means expression like a page in a book
It's not an idiom. It means the tip of your nostril.
"Sieve" is not an idiom. See the related link.
This is not an idiom. It is a measurement. $100,000 is how you write it in numbers.
Simply its mean a bully.
The idiom your blood is boiling usually means that you are mad/furious.
Nothing. You have left out part of the idiom. Perhaps you mean "your hands are tied," which means that you have no power to do anything in a given situation.
"Penniless" is not an idiom. It means that you don't have a penny to spend. It's used as an exaggeration to mean that you don't have any money.
I think it means that that person agrees with that others persons idiom and that it fit that question that the teacher or whoever asked that question.