Lots of things have an expiration date. Water. A child’s car seat. Bottles of hand sanitizer. But what about postage stamps? Do they expire, or are you free to use them indefinitely?
The answer is no, they don’t expire, but there’s an asterisk attached.
Stamps themselves don’t have an expiration date, so that book of Winter Olympics commemorative postage you bought back in 2010 is still technically good. In fact, you can use some pretty old stamps if you wanted to. According to the United States Postal Service website:
All postage stamps issued by the United States since 1860 are valid for postage from any point in the United States or from any other place where U.S. Mail service operates. You may use any Denomination stamp(s) to equal the total postage affixed. Total postage affixed must equal at least the postage charge for the class of the mail.