Bilbo Baggins is said to have been born on 22 September in Tolkien’s The Lord of the Rings.
Bilbo’s birthday is 22 September, a date shared with Frodo Baggins. In The Fellowship of the Ring, Bilbo celebrates his eleventy-first birthday while Frodo reaches his thirty-third birthday. Their joint party provides the opening setting for the Ring’s disappearance and Bilbo’s departure from the Shire.
The date became important in the real world because Tolkien’s fans adopted 22 September as Hobbit Day. The celebration is often paired with Tolkien Week, although the exact observance can vary among organizations and communities.
Bilbo’s age of 111 uses the distinctive Hobbit way of expressing numbers: “eleventy-one.” Frodo’s age of 33 is significant because Hobbits traditionally come of age at thirty-three. The birthday date is therefore both a plot device and a compact introduction to Hobbit customs, longevity, and the relationship between Bilbo and Frodo.