In J.R.R. Tolkien’s writings, Bilbo and Frodo Baggins share the birthday of 22 September.
Bilbo was born on 22 September 2890 of the Third Age, while Frodo was born on 22 September 2968. The date is especially memorable because Bilbo’s birthday party opens The Fellowship of the Ring, the first volume of The Lord of the Rings. Bilbo turns 111 and Frodo turns 33 at the same celebration.
The shared date links the two hobbits before Frodo becomes the Ring-bearer. Bilbo’s adoption of Frodo and his earlier discovery of the One Ring make him central to the later quest, even though Frodo carries the Ring toward Mordor.
Readers sometimes assume the party is Frodo’s 33rd birthday alone. Tolkien’s narrative emphasizes that it celebrates both birthdays, with Bilbo’s unusually large age and Frodo’s coming of age being marked together.