To celebrate, the Carter Center is asking the public to sign a virtual card on its website ... said you can wish President Carter a happy 100th birthday by posting on its mosaic wall online.

Ian Forsyth/Getty King Charles and Queen Camilla have kept the royal tradition of celebrating U.K. residents turning 100 with a special birthday card ... (for the 100th and 105th birthdays ...

To celebrate, the Carter Center is asking the public to sign a virtual card on its website ... The organization said you can wish President Carter a happy 100th birthday by posting on its mosaic wall ...