Winnie-the-Pooh is turning 90 years old on August 21st, can you believe it? In celebration, the New York Public Library—where Pooh and his pals Eeyore, Tigger, Piglet and Kanga reside—invite you to give Pooh a card via their magical mailbox. They write: "we have a mailbox at the Children’s Center at 42nd Street and are accepting cards on Winnie’s behalf. After all, the original Winnie-the-Pooh doll set is at the Library, on view in the Children’s Center, in a special room surrounded by art of the 100 Acre Wood!" (You can even make the birthday bear a customized card.)

The day before the big 9-0, they'll also celebrate with a big Winnie-the-Pooh birthday bash, featuring face painting, balloon animals, crafts, and more. Until then, here's a classic 1966 episode you can enjoy