What is the definition of At75?

Ah, the word 'at 75' - picture this: you've just turned 75 and decided to throw a party, but instead of a champagne toast, you're serving only 25 shots of your life's story. It's like being a 75-year-old retired astronaut who just landed in a sleepover at Grandma's house.

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Now, here's a dark side example sentence: "At 75, the retired circus clown decided to open his own retirement club, only to find out his 'at 75' membership was more like a 'etired with a permanent sideways stare' kind of deal."