A majority of young people seem to develop mental arteriosclerosis forty years before they get the physical kind. Another question: why do some people remain open and elastic into extreme old age, whereas others become rigid and unproductive before they're fifty?

Summary

This quote suggests that many young people tend to have closed or rigid mindsets, symbolized by "mental arteriosclerosis," long before they experience physical aging. It poses a question about why some individuals retain an open and flexible outlook even in extreme old age, while others become rigid and unproductive much earlier in life. The quote highlights the importance of maintaining a youthful mindset and embracing adaptability throughout life, implying that mental rigidity can hinder personal growth and productivity.

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