[Ans] What is the estimated lifespan of a U.S. $1 bill?

Step 1 : Introduction to the question "What is the estimated lifespan of a U.S. $1 bill?"

...What is the average life of a $1 bill? As a result, the average lifespan of a $100 bill is 15 years while a $5 bill lasts just 4.9 years. Dollar bills last just under 6 years on average while the $20 bill has a relatively healthy lifespan at 7.7 years.

 How long does a 1 dollar bill last in circulation? That depends on the denomination of the note. A $1 bill lasts 18 months; $5 bill, two years; $10 bill, three years; $20 bill, four years; and $50 and $100 bills, nine years. Bills that get worn out from everyday use are taken out of circulation and replaced.

Step 2 : Answer to the question "What is the estimated lifespan of a U.S. $1 bill?"

5.5 years:

The Federal Reserve Bank determines the quality of each bill, or note, that gets deposited into one of its branches. Sophisticated processing equipment evaluates each note as it comes through. The notes that are still in good condition and meet the strict quality criteria of the Federal Reserve go back into circulation. The Fed removes from circulation those that don't meet the required quality standard and destroys them. The larger denominations, such as the $100 bill, tend to stay in circulation longer because they aren't passed between users as frequently as the lower denomination bills. Source: FederalReserve.gov

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