We’re headed further and further into a paperless currency world in the near future, but bills still have a role right now. Below is a list of the average lifespan for a number of denominations, which don’t last long. It’s taken from an Atlantic article, The Destruction of Money.

• $1 bills: 3.7 years
• $5 bills: 3.4 years
• $10 bills: 3.4 years
• $20 bills: 5.1 years
• $50 bills: 12.6 years
• $100 bills: 8.9 years