The Elf on the Shelf is a Christmas tradition that is typically associated with children. The elf is believed to be a magical creature who reports back to Santa on a child's behavior throughout the holiday season. The tradition usually begins when children are around two or three years old, and it is commonly believed that the elf stops coming once the child reaches the age of eight or nine. However, some families may continue the tradition even after their children have grown up and moved out. Ultimately, it is up to each family to decide when the Elf on the Shelf stops coming.