In The Hobbit 3: The Battle of the Five Armies, Bilbo Baggins was about 100 years old. In The Lord of the Rings, Bilbo Baggins's age is around 80 to 100 years old. Because the Lord of the Rings was forged and widely circulated when he was young, his age may change as the story develops. During the War of the Five Armies, Birbo was already old and served as an advisor to the Elven Kingdom, so his age may be consistent with this time.