Can I use stamps from 2020?

Do Stamps Expire? In short – NO, they do not ever expire as long as they can be validated as legitimate postage.

Are commemorative stamps worth anything?

Part of an ‘instant’ or manufactured collection: Sheets of stamps which are themed or marked with a commemorative inscription, marking an anniversary or event, are sold in their thousands. They are hardly ever worth anything significant unless, of course, they contain a rare stamp error.