Walter Breuning plans to attend an invitation-only birthday party on Tuesday afternoon at the Rainbow Retirement Community in downtown Great Falls.
He is expected to have cake and deliver a speech at the party that will include Montana Gov. Brian Schweitzer and representatives from Guinness World Records.
Breuning was born on Sept. 21, 1896, in Melrose, Minn., and moved to Montana in 1918. He worked for the Great Northern Railway for 50 years.
His wife, Agnes, died in 1957. The couple had no children.