Passage from the article

▬ from [[harvard-study-of-adult-development]]

The Harvard Study of Adult Development — begun in 1938, now in its ninth decade — is the longest-running longitudinal study of adult life in human history. It is the empirical anchor for the claim that **the quality of close relationships is the single strongest predictor of long-term well-being, health, and longevity**, stronger than genes, wealth, career success, IQ, or cholesterol. For [[deep-ambition-book-thesis]] this study is the single most important citation: it converts the "deep relationships" dimension from soft aspiration to the most replicated finding in life-course research.

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