Well, darling, the correct term to use is "91st birthday." You wouldn't say "91th" unless you want to sound like you failed basic English. So go ahead and celebrate that 91st birthday in style, just make sure to use the right words while you're at it. Cheers to 91 years of wisdom and wrinkles!
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A 50th birthday is commonly referred to as a "golden birthday" or a "half-century birthday" as it marks reaching the milestone age of fifty years.
A 90th birthday anniversary is commonly referred to as a "90th birthday" or a "90th birthday celebration." Some people may also call it a "ninetieth birthday" or a "90th birthday milestone."
A 60th birthday is commonly referred to as a "diamond jubilee" or simply as a "60th birthday celebration."
Your 80th birthday is commonly referred to as your "octogenarian" birthday. The term "octogenarian" comes from the Latin word for eighty, which is "octoginta." It is a significant milestone as you enter your ninth decade of life.
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