To be put on a postage stamp a person must have made an exceptional contribution to American society and culture, and the decision to feature a living individual on a stamp is made on a case-by-case basis by the US Postal Service. Additionally, the individual must give their consent to be featured on the stamp.
Unlike regular postage stamps, which typically increase in price when the cost of postage goes up, Forever stamps are valid for mailing letters no matter how much the price of postage increases. This feature makes them a convenient and economical option for anyone who needs to send out frequent mailings.