Yes, absolutely!

We understand that sometimes life gets in the way and postcards do not get sent out in a timely fashion. That is okay, you can still send the postcard late. Just make sure that you send the postcard to arrive within a year of the date you requested the address. Also make sure that the member whose address you were given is still an active member of Postcrossing. Once the member gets the postcard and registers it, the postcard will be registered as a normal postcard.