Read on to get a closer look at the Federal Reserve notes currently in circulation, the issuance and circulation processes, and the lifespan of U.S. banknotes. The Journey to Circulation Learn how U.S. currency gets into circulation. Life Cycle Infographic Learn about the life cycle of a Federal Reserve note with this mobile-friendly infographic. The Lifespan of U.S. Currency Learn how long U.S. currency lasts in circulation. U.S. Currency in Circulation Learn about cash in circulation domestically and internationally.