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Music, cake and flowers marked the occasion at the Le Bleu Chateau Retirement Community in Burbank, Allen's home for the last 11 years.
"Usually she's a very happy person, and very good natured, gets along with everybody," said Ethel Nowlin, Allen's best friend.
Allen was born in Texas, where she worked as a teacher. Later, she and her husband moved to California and raised a son.
While Allen was short on words at the party, Nowlin summed up the secret to her friend's longevity, with a lesson for all of us.
"I don't think she really worries or has stress or things like that. She just takes things as they come," said Nowlin.
Allen has a niece and a grand-niece who still live in Texas.