There is no age requirement for obtaining a Social Security card. In fact, most parents request their child's Social Security number and card upon the child's birth. Many hospitals will help walk new parents through this process, and the Social Security card usually arrives in a few weeks. For people not born in the United States, a number and card may be requested depending on your immigration status. However, there are still no age requirements for obtaining a card and number. Some other criteria may need to be met though such as immigration status and identity verification. If you have lost your Social Security card, you can always request a new one from the Social Security office.