Which "Age Buster" was known for saying "Too many people, when they get old, think that they have to live by the calendar"?

Name: Which "Age Buster" was known for saying "Too many people, when they get old, think that they have to live by the calendar"?
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Question

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John Glenn, the astronaut and senator, was known for challenging age-related stereotypes and famously said, "Too many people, when they get old, think that they have to live by the calendar."

Which "Age Buster" Was Known for Saying "Too Many People