A 55 cent stamp will always be worth 55 cents. Example; say if postage for a regular size letter is 60 cents and you put that 55 cent stamp on it you would still need a 5 cent stamp. Forever stamps will always be worth the current rate for a regular size and weight letter. Example: if postage stamps are 55 cents today and you buy them at 55 cents today and ten years from now let's say the rate goes up to $1.50, your stamps that you got at 55 cents ten years before will be good to cover that dollar fifty. Or whatever postage is in the future, forever.
if it's a forever stamp you can use it forever
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