When US banknotes wear out, they are withdrawn from circulation and shredded. The shredded notes are buried in landfill sites or used as souvenirs for the public tours of the Federal Reserve Banks.

But how long does a note last? Unsurprisingly, different values of note have different life spans. A $1 bill, says the Federal Reserve, lasts 21 months, while the $100 lasts for 89 months.