How long does paper money last in circulation?

Paper money's lifespan varies depending on the country and currency. However, on average, paper money can remain in circulation for several years. In the United States, for instance, the average lifespan of a $1 bill is about 4.5 years, while a $100 bill can last for up to 15 years. The lifespan of paper money is influenced by various factors, including the frequency of use, exposure to moisture, and the type of paper used. As a result, paper money in some countries may have a shorter or longer lifespan due to these specific factors.