Only if you're afraid to spend them. Bills are dated by "series" and not by the year they were printed. A series currently begins when a new Treasury Secretary takes office and ends when they leave. In the past, series were even longer - the 1935 $1 bill series was printed until the mid-1960s, for example!
20.00 dollar bill 2 face
What is the difference in a 2004 twenty dollar bill and a 2004A twenty dollar bill?
There are many possible types of misprints. Please post a new and separate question that describes the misprint.
$20
Ah, 20 dollars.
$20 Dollars.
nothing
$20 bills don't have pictures of airplanes on them.
Please post a new question with the bill's date
The security thread was first used in the Series 1990 notes
If you have four of them, then the set is worth $80.
The Australian Koala series of coins were only ever minted in platinum and the Twenty-Five Dollar coin was only ever issued as part of a set.